pika vs mouse hare

pika and mouse hare both are nouns.

Word	Noun	Adjective	Verb	Adverb
pika	Yes	No	No	No
mouse hare	Yes	No	No	No

As nouns, pika and mouse hare are synonyms defined as:

pika and mouse hare: small short-eared burrowing mammal of rocky uplands of Asia and western North America

Other synonyms of pika include coney, cony, rock rabbit.

pika (noun)	mouse hare (noun)
small short-eared burrowing mammal of rocky uplands of Asia and western North America	small short-eared burrowing mammal of rocky uplands of Asia and western North America