Alca torda vs razorbill

Alca torda and razorbill both are nouns.

Word	Noun	Adjective	Verb	Adverb
Alca torda	Yes	No	No	No
razorbill	Yes	No	No	No

As nouns, Alca torda and razorbill are synonyms defined as:

Alca torda and razorbill: black-and-white northern Atlantic auk having a compressed sharp-edged bill

Other synonyms of Alca torda include razor-billed auk.

Alca torda (noun)	razorbill (noun)
black-and-white northern Atlantic auk having a compressed sharp-edged bill	black-and-white northern Atlantic auk having a compressed sharp-edged bill