cowpoke vs roper

cowpoke and roper both are nouns.

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

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

cowpoke: a hired hand who tends cattle and performs other duties on horseback
roper: a cowboy who uses a lasso to rope cattle or horses

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

cowpoke (noun)	roper (noun)
a hired hand who tends cattle and performs other duties on horseback	a craftsman who makes ropes
	a cowboy who uses a lasso to rope cattle or horses
	a decoy who lures customers into a gambling establishment (especially one with a fixed game)