adventurer vs argonaut

adventurer and argonaut both are nouns.

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

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

adventurer: a person who enjoys taking risks
argonaut: someone engaged in a dangerous but potentially rewarding adventure

adventurer (noun)	argonaut (noun)
a person who enjoys taking risks	someone engaged in a dangerous but potentially rewarding adventure
someone who travels into little known regions (especially for some scientific purpose)