grey mullet vs liza

grey mullet and liza both are nouns.

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

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

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

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

grey mullet (noun)	liza (noun)
freshwater or coastal food fishes a spindle-shaped body; found worldwide	similar to the striped mullet and takes its place in the Caribbean region
highly valued lean flesh of marine or freshwater mullet