napu vs mouse deer

napu and mouse deer both are nouns.

Word	Noun	Adjective	Verb	Adverb
napu	Yes	No	No	No
mouse deer	Yes	No	No	No

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

napu: chevrotain somewhat larger than the kanchil; found in India and Malaya
mouse deer: very small hornless deer-like ruminant of tropical Asia and west Africa

Other hypernyms of napu include chevrotain.

napu (noun)	mouse deer (noun)
chevrotain somewhat larger than the kanchil; found in India and Malaya	very small hornless deer-like ruminant of tropical Asia and west Africa