biped vs creature

biped and creature both are nouns.

Word	Noun	Adjective	Verb	Adverb
biped	Yes	Yes	No	No
creature	Yes	No	No	No

As nouns, creature is a hypernym of biped; that is, creature is a word with a broader meaning than biped:

Other hypernyms of biped include animal, animate being, beast, brute, fauna.

biped (noun)	creature (noun)
an animal with two feet	a living organism characterized by voluntary movement
	a living being
	a person who is controlled by others and is used to perform unpleasant or dishonest tasks for someone else

biped (adjective)	creature (adjective)
having two feet