making love vs sexual practice

making love and sexual practice both are nouns.

Word	Noun	Adjective	Verb	Adverb
making love	Yes	No	No	No
sexual practice	Yes	No	No	No

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

making love: sexual activities (often including sexual intercourse) between two people
sexual practice: activities associated with sexual intercourse

Other hypernyms of making love include sex, sex activity, sexual activity.

making love (noun)	sexual practice (noun)
sexual activities (often including sexual intercourse) between two people	activities associated with sexual intercourse