fossa vs viverrine mammal

fossa and viverrine mammal both are nouns.

Word	Noun	Adjective	Verb	Adverb
fossa	Yes	No	No	No
viverrine mammal	Yes	No	No	No

As nouns, viverrine mammal is a hypernym of fossa; that is, viverrine mammal is a word with a broader meaning than fossa:

fossa: largest carnivore of Madagascar; intermediate in some respects between cats and civets
viverrine mammal: small cat-like predatory mammals of warmer parts of the Old World

Other hypernyms of fossa include viverrine.

fossa (noun)	viverrine mammal (noun)
largest carnivore of Madagascar; intermediate in some respects between cats and civets	small cat-like predatory mammals of warmer parts of the Old World
a concavity in a surface (especially an anatomical depression)