dory vs John Dory

dory and John Dory both are nouns.

Word	Noun	Adjective	Verb	Adverb
dory	Yes	No	No	No
John Dory	Yes	No	No	No

As nouns, John Dory is a hyponym of dory; that is, John Dory is a word with a more specific, narrower meaning than dory:

Other hyponyms of dory include Zeus faber.

dory (noun)	John Dory (noun)
marine fishes widely distributed in mid-waters and deep slope waters	European dory
pike-like freshwater perches
a small boat of shallow draft with cross thwarts for seats and rowlocks for oars with which it is propelled