windtalker vs secret agent

windtalker and secret agent both are nouns.

Word	Noun	Adjective	Verb	Adverb
windtalker	Yes	No	No	No
secret agent	Yes	No	No	No

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

windtalker: a secret agent who was one of the Navajos who devised and used a code based on their native language; the code was unbroken by the Japanese during World War II
secret agent: a person secretly employed in espionage for a government

Other hypernyms of windtalker include intelligence agent, intelligence officer, operative.

windtalker (noun)	secret agent (noun)
a secret agent who was one of the Navajos who devised and used a code based on their native language; the code was unbroken by the Japanese during World War II	a person secretly employed in espionage for a government