notornis vs Notornis mantelli

notornis and Notornis mantelli both are nouns.

Word	Noun	Adjective	Verb	Adverb
notornis	Yes	No	No	No
Notornis mantelli	Yes	No	No	No

As nouns, notornis and Notornis mantelli are synonyms defined as:

notornis and Notornis mantelli: flightless New Zealand birds similar to gallinules

Other synonyms of notornis include takahe.

notornis (noun)	Notornis mantelli (noun)
flightless New Zealand birds similar to gallinules	flightless New Zealand birds similar to gallinules