investment banker vs underwriter

investment banker and underwriter both are nouns.

Word	Noun	Adjective	Verb	Adverb
investment banker	Yes	No	No	No
underwriter	Yes	No	No	No

As nouns, investment banker and underwriter are synonyms defined as:

investment banker and underwriter: a banker who deals chiefly in underwriting new securities

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