Arkansas kingbird vs western kingbird

Arkansas kingbird and western kingbird both are nouns.

Word	Noun	Adjective	Verb	Adverb
Arkansas kingbird	Yes	No	No	No
western kingbird	Yes	No	No	No

As nouns, Arkansas kingbird and western kingbird are synonyms defined as:

Arkansas kingbird and western kingbird: a kingbird seen in western United States; head and back are pale grey and the breast is yellowish and the tail is black

Arkansas kingbird (noun)	western kingbird (noun)
a kingbird seen in western United States; head and back are pale grey and the breast is yellowish and the tail is black	a kingbird seen in western United States; head and back are pale grey and the breast is yellowish and the tail is black