dogfish vs ganoid

dogfish and ganoid both are nouns.

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

As nouns, ganoid is a hypernym of dogfish; that is, ganoid 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: primitive fishes having thick bony scales with a shiny covering

Other hypernyms of dogfish include ganoid fish.

dogfish (noun)	ganoid (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