mouse hare vs pika

mouse hare and pika both are nouns.

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

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

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

Other synonyms of mouse hare include coney, cony, rock rabbit.

mouse hare (noun)	pika (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