invertebrate vs fauna

invertebrate and fauna both are nouns.

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

As nouns, fauna is a hypernym of invertebrate; that is, fauna 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
fauna: a living organism characterized by voluntary movement

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

invertebrate (noun)	fauna (noun)
any animal lacking a backbone or notochord; the term is not used as a scientific classification	a living organism characterized by voluntary movement
	all the animal life in a particular region or period

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