cowpuncher vs cowgirl

cowpuncher and cowgirl both are nouns.

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

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

cowpuncher: a hired hand who tends cattle and performs other duties on horseback
cowgirl: a woman cowboy

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

cowpuncher (noun)	cowgirl (noun)
a hired hand who tends cattle and performs other duties on horseback	a woman cowboy