The Five Nouns in Arabic: أب، أخ، حم، فم and ذو

In this Arabic grammar lesson, we will study a special category of nouns called الأَسْمَاءُ الخَمْسَةُ, meaning the five nouns in Arabic.

These nouns are important for understanding Arabic declension, reading literary Arabic correctly and analyzing certain passages of the Quran. Unlike many Arabic nouns whose grammatical case is marked by final vowels, the five nouns can be declined with specific letters according to their grammatical function.

This rule is useful for students who want to learn Arabic online, improve their literary Arabic, progress in Modern Standard Arabic or strengthen their understanding of Quranic Arabic.

What are the five nouns in Arabic?

The five nouns form a special grammatical category in Arabic. They are called الأَسْمَاءُ الخَمْسَةُ.

The five nouns are:

• أَبٌ: father;
• أَخٌ: brother;
• حَمٌ: father-in-law;
• فَمٌ: mouth;
• ذُو: possessor of, endowed with.

These words are frequent in literary Arabic, Quranic Arabic and many Arabic expressions.

Why are the five nouns special?

Most Arabic nouns are declined with final vowels: ḍamma in the nominative, fatḥa in the accusative and kasra in the genitive.

The five nouns, when they meet certain grammatical conditions, are declined with letters:

• in the nominative المرفوع, the marker is و;
• in the accusative المنصوب, the marker is ا;
• in the genitive المجرور, the marker is ي.

Examples:

• أَبُوكَ: your father, nominative;
• رَأَيْتُ أَبَاكَ: I saw your father, accusative;
• مَرَرْتُ بِأَبِيكَ: I passed by your father, genitive.

General table of the five nouns

The nouns أَبٌ and أَخٌ

The two easiest nouns to recognize are أَبٌ, meaning “father”, and أَخٌ, meaning “brother”.

When a pronoun or complement is added to these words, their form can change according to the grammatical case.

Examples:

• كِتَابُكَ: your book;
• أَبُوكَ: your father;
• أَخُوكَ: your brother.

In أَبُوكَ and أَخُوكَ, the letter و appears as the nominative marker.

The nominative case of the five nouns

In the nominative case, the five nouns take the letter و. The nominative is used for subjects, predicates and other elements in a raised grammatical position.

The accusative case of the five nouns

In the accusative case, the five nouns take the letter ا. The accusative appears especially with direct objects or after certain particles that make a noun accusative.

The genitive case of the five nouns

In the genitive case, the five nouns take the letter ي. The genitive appears after a preposition or in certain annexation structures.

The noun أَبٌ: father

The noun أَبٌ means “father”. In the rule of the five nouns, it takes the following forms:

• أَبُو in the nominative;
• أَبَا in the accusative;
• أَبِي in the genitive.

Quranic examples:

وَأَبُونَا شَيْخٌ كَبِيرٌ

And our father is a very old man. (28:23)

وَجَاءُوا أَبَاهُمْ عِشَاءً يَبْكُونَ

And they came to their father at night, weeping. (12:16)

تَبَّتْ يَدَا أَبِي لَهَبٍ وَتَبَّ

May the two hands of Abū Lahab perish, and may he perish. (111:1)

The noun أَخٌ: brother

The noun أَخٌ means “brother”. In the rule of the five nouns, it takes the following forms:

• أَخُو in the nominative;
• أَخَا in the accusative;
• أَخِي in the genitive.

Quranic examples:

وَاذْكُرْ أَخَا عَادٍ

And mention the brother of ‘Ād. (46:21)

لِيُرِيَهُ كَيْفَ يُوَارِي سَوْءَةَ أَخِيهِ

So that he might show him how to hide the body of his brother. (5:31)

إِذْ قَالَ لَهُمْ أَخُوهُمْ نُوحٌ أَلَا تَتَّقُونَ

When their brother Noah said to them: “Will you not fear Allah?” (26:106)

The noun حَمٌ: father-in-law

The noun حَمٌ means “father-in-law” or “relative by marriage” depending on the context. It also belongs to the five nouns.

• حَمُو in the nominative;
• حَمَا in the accusative;
• حَمِي in the genitive.

This form is less frequent than أَبٌ and أَخٌ, but it remains important in classical Arabic grammar.

The noun فَمٌ: mouth

The noun فَمٌ means “mouth”. In the rule of the five nouns, its special form often loses the م in declined forms:

• فُو in the nominative;
• فَا in the accusative;
• فِي in the genitive.

Quranic example:

كَفَّيْهِ إِلَى الْمَاءِ لِيَبْلُغَ فَاهُ وَمَا هُوَ بِبَالِغِهِ

Like one who stretches his hands toward water so it may reach his mouth, but it will never reach it. (13:14)

The noun ذُو: possessor of / endowed with

The Arabic word ذُو expresses possession, quality or attribute. It can be translated according to context as “possessor of”, “endowed with”, “having” or “characterized by”.

It is very common in the Quran, especially in expressions describing a quality, a situation or an affiliation.

Forms of ذُو according to number and case

Feminine forms with ذَات

In summary, ذُو generally means “possessor of” or “endowed with”. However, its exact meaning always depends on context.

Quranic examples with ذُو and ذَات

وَنُقَلِّبُهُمْ ذَاتَ الْيَمِينِ وَذَاتَ الشِّمَالِ

And We turned them to the right and to the left. (18:18)

وَإِن كَانَ ذُو عُسْرَةٍ فَنَظِرَةٌ إِلَىٰ مَيْسَرَةٍ

And if the debtor is in hardship, then grant him time until ease. (2:280)

وَاللَّـهُ ذُو الْفَضْلِ الْعَظِيمِ

And Allah is the Possessor of great bounty. (2:105)

ذَوَاتَا أَفْنَانٍ

Having many branches. (55:48)

وَبِالْوَالِدَيْنِ إِحْسَانًا وَذِي الْقُرْبَىٰ

And be good to parents and relatives. (2:83)

وَإِن كُنَّ أُولَاتِ حَمْلٍ

And if they are pregnant. (65:6)

تَبَارَكَ اسْمُ رَبِّكَ ذِي الْجَلَالِ وَالْإِكْرَامِ

Blessed is the name of your Lord, full of majesty and honor. (55:78)

General conditions for the declension of the five nouns

For the five nouns to be declined with و, ا and ي, they generally need to meet certain grammatical conditions.

• They should be in annexation, meaning attached to another noun or pronoun.
• They should not be diminutive.
• They should be singular.
• They should not be attached to the first-person pronoun ي in some cases where the form changes.
• For فَمٌ, the special form generally appears when the م is removed.

These conditions can be studied progressively. For a beginner, the most important step is to recognize the most common forms: أَبُو, أَبَا, أَبِي, أَخُو, أَخَا, أَخِي, ذُو, ذَا and ذِي.

How to memorize the five nouns

To memorize this rule, first remember the logic of the letters:

• و for the nominative;
• ا for the accusative;
• ي for the genitive.

Then practice with the most frequent forms:

This rule appears regularly in Modern Standard Arabic texts, Arabic grammar books and Quranic Arabic lessons.

Common mistakes to avoid

• Forgetting that the five nouns can be declined with letters, not only vowels.
• Using أَبُو in all grammatical cases.
• Confusing أَخُو, أَخَا and أَخِي.
• Forgetting the accusative form with ا.
• Not recognizing ذُو, ذَا and ذِي in Quranic verses.
• Confusing ذُو with the feminine forms ذَات and أُولَات.

Learn Arabic grammar with a teacher

Understanding the five nouns in Arabic is an important step for improving Arabic reading, grammatical comprehension and written expression. This rule helps students understand Arabic declension, annexation and many Quranic passages.

To learn Arabic effectively, it is important to follow a structured method. An online Arabic course helps students work on Arabic grammar, reading, pronunciation and vocabulary with a teacher who corrects their mistakes.

At Al-Dirassa, you can follow a private Arabic course, improve your literary Arabic, strengthen your Quranic Arabic or use free Arabic learning resources.

FAQ — The five nouns in Arabic

How do you say “the five nouns” in Arabic?

It is called الأَسْمَاءُ الخَمْسَةُ.

What are the five nouns in Arabic?

The five nouns are generally أَبٌ, أَخٌ, حَمٌ, فَمٌ and ذُو.

What is the nominative marker of the five nouns?

In the nominative, the five nouns generally take the letter و, as in أَبُو or أَخُو.

What is the accusative marker of the five nouns?

In the accusative, the five nouns generally take the letter ا, as in أَبَا or أَخَا.

What is the genitive marker of the five nouns?

In the genitive, the five nouns generally take the letter ي, as in أَبِي or أَخِي.

What does ذُو mean?

ذُو means “possessor of”, “endowed with” or “having”, depending on context. For example, ذُو الْفَضْلِ means “possessor of bounty”.

Conclusion

The five nouns in Arabic, الأَسْمَاءُ الخَمْسَةُ, are an important topic for understanding Arabic declension. The main forms to remember are أَبُو، أَبَا، أَبِي, أَخُو، أَخَا، أَخِي, حَمُو، حَمَا، حَمِي, فُو، فَا، فِي and ذُو، ذَا، ذِي.

This rule appears in classical texts, literary Arabic and the Quran. With a progressive method, regular examples and correction from a teacher, students can recognize these forms more easily and make lasting progress in Arabic grammar.