venturer vs risk taker

venturer and risk taker both are nouns.

Word	Noun	Adjective	Verb	Adverb
venturer	Yes	No	No	No
risk taker	Yes	No	No	No

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

venturer: a person who enjoys taking risks
risk taker: someone who risks loss or injury in the hope of gain or excitement

venturer (noun)	risk taker (noun)
a person who enjoys taking risks	someone who risks loss or injury in the hope of gain or excitement
a merchant who undertakes a trading venture (especially a venture that sends goods overseas)