Alosa alosa vs shad

Alosa alosa and shad both are nouns.

Word	Noun	Adjective	Verb	Adverb
Alosa alosa	Yes	No	No	No
shad	Yes	No	No	No

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

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

Alosa alosa (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