helleri vs swordtail

helleri and swordtail both are nouns.

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

As nouns, helleri and swordtail are synonyms defined as:

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

Other synonyms of helleri include topminnow, Xyphophorus helleri.

helleri (noun)	swordtail (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