buckeroo vs buckaroo

buckeroo and buckaroo both are nouns.

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

As nouns, buckeroo and buckaroo are synonyms defined as:

buckeroo and buckaroo: local names for a cowboy (`vaquero' is used especially in southwestern and central Texas and `buckaroo' is used especially in California)

Other synonyms of buckeroo include vaquero.

buckeroo (noun)	buckaroo (noun)
local names for a cowboy (`vaquero' is used especially in southwestern and central Texas and `buckaroo' is used especially in California)	local names for a cowboy (`vaquero' is used especially in southwestern and central Texas and `buckaroo' is used especially in California)