poeciliid vs platy

poeciliid and platy both are nouns.

Word	Noun	Adjective	Verb	Adverb
poeciliid	Yes	No	No	No
platy	Yes	No	No	No

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

poeciliid: small usually brightly-colored viviparous surface-feeding fishes of fresh or brackish warm waters; often used in mosquito control
platy: small stocky Mexican fish; popular aquarium fish

Other hyponyms of poeciliid include Gambusia affinis, mosquitofish, Platypoecilus maculatus, mollie, molly.

poeciliid (noun)	platy (noun)
small usually brightly-colored viviparous surface-feeding fishes of fresh or brackish warm waters; often used in mosquito control	small stocky Mexican fish; popular aquarium fish