securities firm vs brokerage firm

securities firm and brokerage firm both are nouns.

Word	Noun	Adjective	Verb	Adverb
securities firm	Yes	No	No	No
brokerage firm	Yes	No	No	No

As nouns, securities firm and brokerage firm are synonyms defined as:

securities firm and brokerage firm: a stock broker's business; charges a fee to act as intermediary between buyer and seller

Other synonyms of securities firm include brokerage.

securities firm (noun)	brokerage firm (noun)
a stock broker's business; charges a fee to act as intermediary between buyer and seller	a stock broker's business; charges a fee to act as intermediary between buyer and seller