NOC vs intelligence agent

NOC and intelligence agent both are nouns.

Word	Noun	Adjective	Verb	Adverb
NOC	Yes	No	No	No
intelligence agent	Yes	No	No	No

As nouns, intelligence agent is a hypernym of NOC; that is, intelligence agent is a word with a broader meaning than NOC:

NOC: an undercover agent who is given no official cover
intelligence agent: a person secretly employed in espionage for a government

Other hypernyms of NOC include intelligence officer, operative, secret agent.

NOC (noun)	intelligence agent (noun)
an undercover agent who is given no official cover	a person secretly employed in espionage for a government