An ordinary fully declinable sound-final singular usually takes fatḥa for the accusative: رَأَيْتُ زَيْدًا.
A sound feminine plural takes kasra instead: رَأَيْتُ مُسْلِمَاتٍ.
Accusative names the grammatical case. Fatḥa and kasra are possible signs of that case in different noun classes.
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Noun Case Classes: Type 2 — Sound Feminine Plural
An ordinary fully declinable sound-final singular usually takes fatḥa for the accusative: رَأَيْتُ زَيْدًا.
A sound feminine plural takes kasra instead: رَأَيْتُ مُسْلِمَاتٍ.
Accusative names the grammatical case. Fatḥa and kasra are possible signs of that case in different noun classes.