ganoid fish vs ganoid

ganoid fish and ganoid both are nouns.

Word	Noun	Adjective	Verb	Adverb
ganoid fish	Yes	No	No	No
ganoid	Yes	No	No	No

As nouns, ganoid fish and ganoid are synonyms defined as:

ganoid fish and ganoid: primitive fishes having thick bony scales with a shiny covering

ganoid fish (noun)	ganoid (noun)
primitive fishes having thick bony scales with a shiny covering	primitive fishes having thick bony scales with a shiny covering