dogfish vs ganoid fish

dogfish and ganoid fish both are nouns.

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

As nouns, ganoid fish is a hypernym of dogfish; that is, ganoid fish is a word with a broader meaning than dogfish:

dogfish: primitive long-bodied carnivorous freshwater fish with a very long dorsal fin; found in sluggish waters of North America
ganoid fish: primitive fishes having thick bony scales with a shiny covering

Other hypernyms of dogfish include ganoid.

dogfish (noun)	ganoid fish (noun)
any of several small sharks	primitive fishes having thick bony scales with a shiny covering
primitive long-bodied carnivorous freshwater fish with a very long dorsal fin; found in sluggish waters of North America