adventurer vs navigator

adventurer and navigator both are nouns.

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

As nouns, navigator is a hyponym of adventurer; that is, navigator is a word with a more specific, narrower meaning than adventurer:

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

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