predator vs piranha

predator and piranha both are nouns.

Word	Noun	Adjective	Verb	Adverb
predator	Yes	No	No	No
piranha	Yes	No	No	No

As nouns, predator and piranha are synonyms defined as:

Other synonyms of predator include marauder, vulture.

predator (noun)	piranha (noun)
any animal that lives by preying on other animals	small voraciously carnivorous freshwater fishes of South America that attack and destroy living animals
someone who attacks in search of booty	someone who attacks in search of booty