cowman vs cowpuncher

cowman and cowpuncher both are nouns.

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

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

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

Other hypernyms of cowman include cowhand, cowherd, cowpoke, puncher, adult male, man.

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