threadfin vs barbu

threadfin and barbu both are nouns.

Word	Noun	Adjective	Verb	Adverb
threadfin	Yes	No	No	No
barbu	Yes	No	No	No

As nouns, barbu is a hyponym of threadfin; that is, barbu is a word with a more specific, narrower meaning than threadfin:

threadfin: mullet-like tropical marine fishes having pectoral fins with long threadlike rays
barbu: found along western Atlantic coast

Other hyponyms of threadfin include Polydactylus virginicus.

threadfin (noun)	barbu (noun)
mullet-like tropical marine fishes having pectoral fins with long threadlike rays	found along western Atlantic coast