invertebrate vs creature

invertebrate and creature both are nouns.

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

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

invertebrate: any animal lacking a backbone or notochord; the term is not used as a scientific classification
creature: a living organism characterized by voluntary movement

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

invertebrate (noun)	creature (noun)
any animal lacking a backbone or notochord; the term is not used as a scientific classification	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

invertebrate (adjective)	creature (adjective)
lacking a backbone or spinal column