bandicoot vs bilby

bandicoot and bilby both are nouns.

Word	Noun	Adjective	Verb	Adverb
bandicoot	Yes	No	No	No
bilby	Yes	No	No	No

As nouns, bilby is a hyponym of bandicoot; that is, bilby is a word with a more specific, narrower meaning than bandicoot:

bandicoot: any of various agile ratlike terrestrial marsupials of Australia and adjacent islands; insectivorous and herbivorous
bilby: bandicoot with leathery ears like a rabbit

Other hyponyms of bandicoot include Macrotis lagotis, rabbit-eared bandicoot, rabbit bandicoot.

bandicoot (noun)	bilby (noun)
any of various agile ratlike terrestrial marsupials of Australia and adjacent islands; insectivorous and herbivorous	bandicoot with leathery ears like a rabbit