cowboy vs venturer

cowboy and venturer both are nouns.

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

As nouns, venturer is a hypernym of cowboy; that is, venturer is a word with a broader meaning than cowboy:

cowboy: someone who is reckless or irresponsible (especially in driving vehicles)
venturer: a person who enjoys taking risks

Other hypernyms of cowboy include adventurer.

cowboy (noun)	venturer (noun)
someone who is reckless or irresponsible (especially in driving vehicles)	a person who enjoys taking risks
a performer who gives exhibitions of riding and roping and bulldogging	a merchant who undertakes a trading venture (especially a venture that sends goods overseas)
a male hired hand who tends cattle and performs other duties on horseback