pika vs rock rabbit

pika and rock rabbit both are nouns.

Word	Noun	Adjective	Verb	Adverb
pika	Yes	No	No	No
rock rabbit	Yes	No	No	No

As nouns, pika and rock rabbit are synonyms defined as:

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

Other synonyms of pika include coney, cony, mouse hare.

pika (noun)	rock rabbit (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
	hyrax that lives in rocky areas