marriage mart vs brokerage firm

marriage mart and brokerage firm both are nouns.

Word	Noun	Adjective	Verb	Adverb
marriage mart	Yes	No	No	No
brokerage firm	Yes	No	No	No

As nouns, brokerage firm is a hypernym of marriage mart; that is, brokerage firm is a word with a broader meaning than marriage mart:

marriage mart: a business that arranges marriage contracts
brokerage firm: a stock broker's business; charges a fee to act as intermediary between buyer and seller

Other hypernyms of marriage mart include brokerage, securities firm.

marriage mart (noun)	brokerage firm (noun)
a business that arranges marriage contracts	a stock broker's business; charges a fee to act as intermediary between buyer and seller