allis vs shad

allis and shad both are nouns.

Word	Noun	Adjective	Verb	Adverb
allis	Yes	No	No	No
shad	Yes	No	No	No

As nouns, shad is a hypernym of allis; that is, shad is a word with a broader meaning than allis:

allis: European shad
shad: herring-like food fishes that migrate from the sea to fresh water to spawn

allis (noun)	shad (noun)
European shad	herring-like food fishes that migrate from the sea to fresh water to spawn
	bony flesh of herring-like fish usually caught during their migration to fresh water for spawning; especially of Atlantic coast