venturer vs argonaut

venturer and argonaut both are nouns.

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

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

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

venturer (noun)	argonaut (noun)
a person who enjoys taking risks	someone engaged in a dangerous but potentially rewarding adventure
a merchant who undertakes a trading venture (especially a venture that sends goods overseas)