muntjac vs deer

muntjac and deer both are nouns.

Word	Noun	Adjective	Verb	Adverb
muntjac	Yes	No	No	No
deer	Yes	No	No	No

As nouns, deer is a hypernym of muntjac; that is, deer is a word with a broader meaning than muntjac:

muntjac: small Asian deer with small antlers and a cry like a bark
deer: distinguished from Bovidae by the male's having solid deciduous antlers

Other hypernyms of muntjac include cervid.

muntjac (noun)	deer (noun)
small Asian deer with small antlers and a cry like a bark	distinguished from Bovidae by the male's having solid deciduous antlers