insurance company vs insurance firm

insurance company and insurance firm both are nouns.

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

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

insurance company and insurance firm: a financial institution that sells insurance

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

insurance company (noun)	insurance firm (noun)
a financial institution that sells insurance	a financial institution that sells insurance