tree swallow vs tree martin

tree swallow and tree martin both are nouns.

Word	Noun	Adjective	Verb	Adverb
tree swallow	Yes	No	No	No
tree martin	Yes	No	No	No

As nouns, tree swallow and tree martin are synonyms defined as:

tree swallow and tree martin: of Australia and Polynesia; nests in tree cavities

Other synonyms of tree swallow include Hirundo nigricans.

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