cowpoke vs cattleman

cowpoke and cattleman both are nouns.

Word	Noun	Adjective	Verb	Adverb
cowpoke	Yes	No	No	No
cattleman	Yes	No	No	No

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

cowpoke: a hired hand who tends cattle and performs other duties on horseback
cattleman: a male hired hand who tends cattle and performs other duties on horseback

Other hyponyms of cowpoke include buckaroo, buckeroo, vaquero, cowgirl, gaucho, horse wrangler, wrangler, roper, cowboy, cowman.

cowpoke (noun)	cattleman (noun)
a hired hand who tends cattle and performs other duties on horseback	a man who raises (or tends) cattle
	a male hired hand who tends cattle and performs other duties on horseback