cowpuncher vs ranch hand

cowpuncher and ranch hand both are nouns.

Word	Noun	Adjective	Verb	Adverb
cowpuncher	Yes	No	No	No
ranch hand	Yes	No	No	No

As nouns, ranch hand is a hypernym of cowpuncher; that is, ranch hand is a word with a broader meaning than cowpuncher:

cowpuncher: a hired hand who tends cattle and performs other duties on horseback
ranch hand: a hired hand on a ranch

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