flying squirrel vs flying opossum

flying squirrel and flying opossum both are nouns.

Word	Noun	Adjective	Verb	Adverb
flying squirrel	Yes	No	No	No
flying opossum	Yes	No	No	No

As nouns, flying squirrel and flying opossum are synonyms defined as:

flying squirrel and flying opossum: nocturnal phalangers that move with gliding leaps using parachute-like folds of skin along the sides of the body

Other synonyms of flying squirrel include flying phalanger.

flying squirrel (noun)	flying opossum (noun)
nocturnal phalangers that move with gliding leaps using parachute-like folds of skin along the sides of the body	nocturnal phalangers that move with gliding leaps using parachute-like folds of skin along the sides of the body