gender vs sexual activity

gender and sexual activity both are nouns.

Word	Noun	Adjective	Verb	Adverb
gender	Yes	No	No	No
sexual activity	Yes	No	No	No

gender (noun)	sexual activity (noun)
the properties that distinguish organisms on the basis of their reproductive roles	activities associated with sexual intercourse
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