Flying squirrel and Opossum

Flying squirrel noun - Nocturnal phalangers that move with gliding leaps using parachute-like folds of skin along the sides of the body.

Opossum and flying squirrel are semantically related. In some cases you can use "Opossum" instead a noun phrase "Flying squirrel".

Opossum noun - Nocturnal arboreal marsupial having a naked prehensile tail found from southern North America to northern South America.

Flying squirrel and opossum are semantically related. Sometimes you can replace phrase "Flying squirrel" with "Opossum", this terms are similar.