tree swallow vs white-bellied swallow

tree swallow and white-bellied swallow both are nouns.

Word	Noun	Adjective	Verb	Adverb
tree swallow	Yes	No	No	No
white-bellied swallow	Yes	No	No	No

As nouns, tree swallow and white-bellied swallow are synonyms defined as:

tree swallow and white-bellied swallow: bluish-green-and-white North American swallow; nests in tree cavities

Other synonyms of tree swallow include Iridoprocne bicolor.

tree swallow (noun)	white-bellied swallow (noun)
of Australia and Polynesia; nests in tree cavities	bluish-green-and-white North American swallow; nests in tree cavities
bluish-green-and-white North American swallow; nests in tree cavities