coition vs sex activity

coition and sex activity both are nouns.

Word	Noun	Adjective	Verb	Adverb
coition	Yes	No	No	No
sex activity	Yes	No	No	No

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

coition: sexual activity between individuals, especially the insertion of a man's penis into a woman's vagina until orgasm and ejaculation occur
sex activity: activities associated with sexual intercourse

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

coition (noun)	sex activity (noun)
sexual activity between individuals, especially the insertion of a man's penis into a woman's vagina until orgasm and ejaculation occur	activities associated with sexual intercourse