cowpuncher vs gaucho

cowpuncher and gaucho both are nouns.

Word	Noun	Adjective	Verb	Adverb
cowpuncher	Yes	No	No	No
gaucho	Yes	No	No	No

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

cowpuncher: a hired hand who tends cattle and performs other duties on horseback
gaucho: a cowboy of the South American Pampas

Other hyponyms of cowpuncher include buckaroo, buckeroo, vaquero, cowgirl, horse wrangler, wrangler, roper, cattleman, cowboy, cowman.

cowpuncher (noun)	gaucho (noun)
a hired hand who tends cattle and performs other duties on horseback	a cowboy of the South American Pampas