topminnow vs cyprinodont

topminnow and cyprinodont both are nouns.

Word	Noun	Adjective	Verb	Adverb
topminnow	Yes	No	No	No
cyprinodont	Yes	No	No	No

As nouns, cyprinodont is a hypernym of topminnow; that is, cyprinodont is a word with a broader meaning than topminnow:

topminnow: freshwater fish of Central America having a long swordlike tail; popular aquarium fish
cyprinodont: any member of the family Cyprinodontidae

topminnow (noun)	cyprinodont (noun)
small usually brightly-colored viviparous surface-feeding fishes of fresh or brackish warm waters; often used in mosquito control	any member of the family Cyprinodontidae
freshwater fish of Central America having a long swordlike tail; popular aquarium fish