marriage vs love match

marriage and love match both are nouns.

Word	Noun	Adjective	Verb	Adverb
marriage	Yes	No	No	No
love match	Yes	No	No	No

As nouns, love match is a hyponym of marriage; that is, love match is a word with a more specific, narrower meaning than marriage:

Other hyponyms of marriage include bridal, espousal, civil marriage, remarriage.

marriage (noun)	love match (noun)
the act of marrying; the nuptial ceremony	a marriage for love's sake; not an arranged marriage
two people who are married to each other
the state of being a married couple voluntarily joined for life (or until divorce)
a close and intimate union