underwriter vs insurance broker

underwriter and insurance broker both are nouns.

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

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

Other synonyms of underwriter include general agent, insurance agent.

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