wallaby vs kangaroo

wallaby and kangaroo both are nouns.

Word	Noun	Adjective	Verb	Adverb
wallaby	Yes	No	No	No
kangaroo	Yes	No	No	No

As nouns, kangaroo is a hypernym of wallaby; that is, kangaroo is a word with a broader meaning than wallaby:

wallaby: any of various small or medium-sized kangaroos; often brightly colored
kangaroo: any of several herbivorous leaping marsupials of Australia and New Guinea having large powerful hind legs and a long thick tail

wallaby (noun)	kangaroo (noun)
any of various small or medium-sized kangaroos; often brightly colored	any of several herbivorous leaping marsupials of Australia and New Guinea having large powerful hind legs and a long thick tail