navigator vs adventurer

navigator and adventurer both are nouns.

Word	Noun	Adjective	Verb	Adverb
navigator	Yes	No	No	No
adventurer	Yes	No	No	No

As nouns, adventurer is a hypernym of navigator; that is, adventurer is a word with a broader meaning than navigator:

navigator: in earlier times, a person who explored by ship
adventurer: someone who travels into little known regions (especially for some scientific purpose)

Other hypernyms of navigator include explorer.

navigator (noun)	adventurer (noun)
in earlier times, a person who explored by ship	a person who enjoys taking risks
the member of an aircrew who is responsible for the aircraft's course	someone who travels into little known regions (especially for some scientific purpose)
the ship's officer in charge of navigation