insurer vs insurance underwriter

insurer and insurance underwriter both are nouns.

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

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

insurer and insurance underwriter: a financial institution that sells insurance

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

insurer (noun)	insurance underwriter (noun)
a financial institution that sells insurance	a financial institution that sells insurance