white-bellied swallow vs tree swallow

white-bellied swallow and tree swallow both are nouns.

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

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

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

Other synonyms of white-bellied swallow include Iridoprocne bicolor.

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