coition vs sex act

coition and sex act both are nouns.

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

As nouns, coition and sex act are synonyms defined as:

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

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