adventurer vs cowboy

adventurer and cowboy both are nouns.

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

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

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

adventurer (noun)	cowboy (noun)
a person who enjoys taking risks	someone who is reckless or irresponsible (especially in driving vehicles)
someone who travels into little known regions (especially for some scientific purpose)	a performer who gives exhibitions of riding and roping and bulldogging
	a male hired hand who tends cattle and performs other duties on horseback