razorbill vs razor-billed auk

razorbill and razor-billed auk both are nouns.

Word	Noun	Adjective	Verb	Adverb
razorbill	Yes	No	No	No
razor-billed auk	Yes	No	No	No

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

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

Other synonyms of razorbill include Alca torda.

razorbill (noun)	razor-billed auk (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