vaquero vs cowpoke

vaquero and cowpoke both are nouns.

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

As nouns, cowpoke is a hypernym of vaquero; that is, cowpoke is a word with a broader meaning than vaquero:

vaquero: local names for a cowboy (`vaquero' is used especially in southwestern and central Texas and `buckaroo' is used especially in California)
cowpoke: a hired hand who tends cattle and performs other duties on horseback

Other hypernyms of vaquero include cowhand, cowherd, cowpuncher, puncher.

vaquero (noun)	cowpoke (noun)
local names for a cowboy (`vaquero' is used especially in southwestern and central Texas and `buckaroo' is used especially in California)	a hired hand who tends cattle and performs other duties on horseback