mullet vs Mugil liza

mullet and Mugil liza both are nouns.

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

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

mullet: freshwater or coastal food fishes a spindle-shaped body; found worldwide
Mugil liza: similar to the striped mullet and takes its place in the Caribbean region

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

mullet (noun)	Mugil liza (noun)
bottom dwelling marine warm water fishes with two barbels on the chin	similar to the striped mullet and takes its place in the Caribbean region
freshwater or coastal food fishes a spindle-shaped body; found worldwide
highly valued lean flesh of marine or freshwater mullet