varmint vs fauna

varmint and fauna both are nouns.

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

As nouns, fauna is a hypernym of varmint; that is, fauna is a word with a broader meaning than varmint:

varmint: any usually predatory wild animal considered undesirable; e.g., coyote
fauna: a living organism characterized by voluntary movement

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

varmint (noun)	fauna (noun)
any usually predatory wild animal considered undesirable; e.g., coyote	a living organism characterized by voluntary movement
an irritating or obnoxious person	all the animal life in a particular region or period