brush kangaroo vs kangaroo

brush kangaroo and kangaroo both are nouns.

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

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

brush kangaroo: 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

brush kangaroo (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