mullet vs Mugil curema

mullet and Mugil curema both are nouns.

Word	Noun	Adjective	Verb	Adverb
mullet	Yes	No	No	No
Mugil curema	Yes	No	No	No

As nouns, Mugil curema is a hyponym of mullet; that is, Mugil curema is a word with a more specific, narrower meaning than mullet:

mullet: freshwater or coastal food fishes a spindle-shaped body; found worldwide
Mugil curema: silvery mullet of Atlantic and Pacific coasts

Other hyponyms of mullet include Mugil cephalus, striped mullet, white mullet, liza, Mugil liza.

mullet (noun)	Mugil curema (noun)
bottom dwelling marine warm water fishes with two barbels on the chin	silvery mullet of Atlantic and Pacific coasts
freshwater or coastal food fishes a spindle-shaped body; found worldwide
highly valued lean flesh of marine or freshwater mullet