Hirundo nigricans vs tree swallow

Hirundo nigricans and tree swallow both are nouns.

Word	Noun	Adjective	Verb	Adverb
Hirundo nigricans	Yes	No	No	No
tree swallow	Yes	No	No	No

As nouns, Hirundo nigricans and tree swallow are synonyms defined as:

Hirundo nigricans and tree swallow: of Australia and Polynesia; nests in tree cavities

Other synonyms of Hirundo nigricans include tree martin.

Hirundo nigricans (noun)	tree swallow (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