The term WOMBAT COUSIN is solved by the crossword answer KOALA, which is a 5 letter word. Koalas are marsupials native to Australia and are closely related to wombats. They are both members of the family Phascolarctidae, which includes other species such as the common wombat, the southern hairy-nosed wombat, and the northern hairy-nosed wombat. Koalas are known for their distinctive features, such as their large ears, round noses, and fluffy fur. They are also well-known for their diet of eucalyptus leaves.