underwriter vs insurance company

underwriter and insurance company both are nouns.

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

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

underwriter and insurance company: a financial institution that sells insurance

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

underwriter (noun)	insurance company (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