gar vs ganoid

gar and ganoid both are nouns.

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

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

gar: primitive predaceous North American fish covered with hard scales and having long jaws with needlelike teeth
ganoid: primitive fishes having thick bony scales with a shiny covering

Other hypernyms of gar include ganoid fish.

gar (noun)	ganoid (noun)
primitive predaceous North American fish covered with hard scales and having long jaws with needlelike teeth	primitive fishes having thick bony scales with a shiny covering
elongate European surface-dwelling predacious fishes with long toothed jaws; abundant in coastal waters