poeciliid vs cypriniform fish

poeciliid and cypriniform fish both are nouns.

Word	Noun	Adjective	Verb	Adverb
poeciliid	Yes	No	No	No
cypriniform fish	Yes	No	No	No

As nouns, cypriniform fish is a hypernym of poeciliid; that is, cypriniform fish is a word with a broader meaning than poeciliid:

poeciliid: small usually brightly-colored viviparous surface-feeding fishes of fresh or brackish warm waters; often used in mosquito control
cypriniform fish: a soft-finned fish of the order Cypriniformes

poeciliid (noun)	cypriniform fish (noun)
small usually brightly-colored viviparous surface-feeding fishes of fresh or brackish warm waters; often used in mosquito control	a soft-finned fish of the order Cypriniformes