bridge agent vs secret agent

bridge agent and secret agent both are nouns.

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

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

bridge agent: an operative who acts as a courier or go-between from a case officer to a secret agent in a hostile area
secret agent: a person secretly employed in espionage for a government

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

bridge agent (noun)	secret agent (noun)
an operative who acts as a courier or go-between from a case officer to a secret agent in a hostile area	a person secretly employed in espionage for a government