Xyphophorus helleri vs topminnow

Xyphophorus helleri and topminnow both are nouns.

Word	Noun	Adjective	Verb	Adverb
Xyphophorus helleri	Yes	No	No	No
topminnow	Yes	No	No	No

As nouns, Xyphophorus helleri and topminnow are synonyms defined as:

Xyphophorus helleri and topminnow: freshwater fish of Central America having a long swordlike tail; popular aquarium fish

Other synonyms of Xyphophorus helleri include helleri, swordtail.

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