buckeroo vs puncher

buckeroo and puncher both are nouns.

Word	Noun	Adjective	Verb	Adverb
buckeroo	Yes	No	No	No
puncher	Yes	No	No	No

As nouns, puncher is a hypernym of buckeroo; that is, puncher is a word with a broader meaning than buckeroo:

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

Other hypernyms of buckeroo include cowhand, cowherd, cowpoke, cowpuncher.

buckeroo (noun)	puncher (noun)
local names for a cowboy (`vaquero' is used especially in southwestern and central Texas and `buckaroo' is used especially in California)	a tool for making holes or indentations
	a hired hand who tends cattle and performs other duties on horseback
	someone who delivers punches