copulation vs sexual practice

copulation and sexual practice both are nouns.

Word	Noun	Adjective	Verb	Adverb
copulation	Yes	No	No	No
sexual practice	Yes	No	No	No

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

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

Other hypernyms of copulation include sex, sex activity, sexual activity.

copulation (noun)	sexual practice (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