secret agent vs intelligence officer

secret agent and intelligence officer both are nouns.

Word	Noun	Adjective	Verb	Adverb
secret agent	Yes	No	No	No
intelligence officer	Yes	No	No	No

As nouns, secret agent and intelligence officer are synonyms defined as:

secret agent and intelligence officer: a person secretly employed in espionage for a government

Other synonyms of secret agent include intelligence agent, operative.

secret agent (noun)	intelligence officer (noun)
a person secretly employed in espionage for a government	a person secretly employed in espionage for a government