razorbill vs auk

razorbill and auk both are nouns.

Word	Noun	Adjective	Verb	Adverb
razorbill	Yes	No	No	No
auk	Yes	No	No	No

As nouns, auk is a hypernym of razorbill; that is, auk is a word with a broader meaning than razorbill:

razorbill: black-and-white northern Atlantic auk having a compressed sharp-edged bill
auk: black-and-white short-necked web-footed diving bird of northern seas

razorbill (noun)	auk (noun)
black-and-white northern Atlantic auk having a compressed sharp-edged bill	black-and-white short-necked web-footed diving bird of northern seas