swordtail vs Xyphophorus helleri

swordtail and Xyphophorus helleri both are nouns.

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

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

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

Other synonyms of swordtail include helleri, topminnow.

swordtail (noun)	Xyphophorus helleri (noun)
freshwater fish of Central America having a long swordlike tail; popular aquarium fish	freshwater fish of Central America having a long swordlike tail; popular aquarium fish