sexuality vs gender

sexuality and gender both are nouns.

Word	Noun	Adjective	Verb	Adverb
sexuality	Yes	No	No	No
gender	Yes	No	No	No

As nouns, sexuality and gender are synonyms defined as:

sexuality and gender: the properties that distinguish organisms on the basis of their reproductive roles

Other synonyms of sexuality include sex.

sexuality (noun)	gender (noun)
the properties that distinguish organisms on the basis of their reproductive roles	the properties that distinguish organisms on the basis of their reproductive roles
	a grammatical category in inflected languages governing the agreement between nouns and pronouns and adjectives; in some languages it is quite arbitrary but in Indo-European languages it is usually based on sex or animateness