canary vs common canary

canary and common canary both are nouns.

Word	Noun	Adjective	Verb	Adverb
canary	Yes	Yes	No	No
common canary	Yes	No	No	No

As nouns, common canary is a hyponym of canary; that is, common canary is a word with a more specific, narrower meaning than canary:

canary: any of several small Old World finches
common canary: native to the Canary Islands and Azores; popular usually yellow cage bird noted for its song

Other hyponyms of canary include Serinus canaria.

canary (noun)	common canary (noun)
any of several small Old World finches	native to the Canary Islands and Azores; popular usually yellow cage bird noted for its song
a moderate yellow with a greenish tinge
a female singer
someone acting as an informer or decoy for the police

canary (adjective)	common canary (adjective)
having the color of a canary; of a light to moderate yellow