razor-billed auk vs Alca torda

razor-billed auk and Alca torda both are nouns.

Word	Noun	Adjective	Verb	Adverb
razor-billed auk	Yes	No	No	No
Alca torda	Yes	No	No	No

As nouns, razor-billed auk and Alca torda are synonyms defined as:

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

Other synonyms of razor-billed auk include razorbill.

razor-billed auk (noun)	Alca torda (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