making love vs love life

making love and love life both are nouns.

Word	Noun	Adjective	Verb	Adverb
making love	Yes	No	No	No
love life	Yes	No	No	No

As nouns, making love and love life are synonyms defined as:

making love and love life: sexual activities (often including sexual intercourse) between two people

Other synonyms of making love include love, lovemaking, sexual love.

making love (noun)	love life (noun)
sexual activities (often including sexual intercourse) between two people	sexual activities (often including sexual intercourse) between two people