conjugation vs sexual activity

conjugation and sexual activity both are nouns.

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

As nouns, sexual activity is a hypernym of conjugation; that is, sexual activity is a word with a broader meaning than conjugation:

Other hypernyms of conjugation include sex, sex activity, sexual practice.

conjugation (noun)	sexual activity (noun)
the act of pairing a male and female for reproductive purposes	activities associated with sexual intercourse
the act of making or becoming a single unit
a class of verbs having the same inflectional forms
the complete set of inflected forms of a verb
the inflection of verbs
the state of being joined together