Brevoortia tyrannis vs clupeid

Brevoortia tyrannis and clupeid both are nouns.

Word	Noun	Adjective	Verb	Adverb
Brevoortia tyrannis	Yes	No	No	No
clupeid	Yes	No	No	No

As nouns, clupeid is a hypernym of Brevoortia tyrannis; that is, clupeid is a word with a broader meaning than Brevoortia tyrannis:

Brevoortia tyrannis: shad-like North American marine fishes used for fish meal and oil and fertilizer
clupeid: any of numerous soft-finned schooling food fishes of shallow waters of northern seas

Other hypernyms of Brevoortia tyrannis include clupeid fish.

Brevoortia tyrannis (noun)	clupeid (noun)
shad-like North American marine fishes used for fish meal and oil and fertilizer	any of numerous soft-finned schooling food fishes of shallow waters of northern seas