ranch hand vs cowhand

ranch hand and cowhand both are nouns.

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

As nouns, cowhand is a hyponym of ranch hand; that is, cowhand is a word with a more specific, narrower meaning than ranch hand:

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

Other hyponyms of ranch hand include cowherd, cowpoke, cowpuncher, puncher.

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