underwriter vs insurance firm

underwriter and insurance firm both are nouns.

Word	Noun	Adjective	Verb	Adverb
underwriter	Yes	No	No	No
insurance firm	Yes	No	No	No

As nouns, underwriter and insurance firm are synonyms defined as:

underwriter and insurance firm: a financial institution that sells insurance

Other synonyms of underwriter include insurance company, insurance underwriter, insurer.

underwriter (noun)	insurance firm (noun)
a financial institution that sells insurance	a financial institution that sells insurance
a banker who deals chiefly in underwriting new securities
an agent who sells insurance