Categories of Noun

The noun has the following morphological characteristics:
Nouns that can be counted have two numbers: singular and plural (e.g. singular: a girl, plural: girls).
Nouns denoting living being (and some nouns denoting lifeless things) have two case forms: the common case and the genitive case.

It is doubtful whether grammatical category of gender exists in Modern English for it is hardly ever expressed by means of grammatical forms.

There is practically only one gender-forming suffix in Modern English, the suffix -es, expressing feminine gender. It is not widely used.

heir- heir-ess

poet- poet-ess

actor- actor-ess

waiter- waitr-ess

host- host-ess

lion- lion-ess

tiger- tigr-ess