tree martin vs Hirundo nigricans

tree martin and Hirundo nigricans both are nouns.

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

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

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

Other synonyms of tree martin include tree swallow.

tree martin (noun)	Hirundo nigricans (noun)
of Australia and Polynesia; nests in tree cavities	of Australia and Polynesia; nests in tree cavities