وَهَذِهِ الْأَرْبَعَةُ تَخْتَصُّ بِالِاسْمِ.
Translation: These four types are specific to nouns.
The first four classifications are noun-related; the fifth is distinct because it is not restricted to nouns.
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Four Types Restricted to Nouns
Tanwīn: Five Types, Their Function, and Omission
وَهَذِهِ الْأَرْبَعَةُ تَخْتَصُّ بِالِاسْمِ.
Translation: These four types are specific to nouns.
The first four classifications are noun-related; the fifth is distinct because it is not restricted to nouns.