pika vs collared pika

pika and collared pika both are nouns.

Word	Noun	Adjective	Verb	Adverb
pika	Yes	No	No	No
collared pika	Yes	No	No	No

As nouns, collared pika is a hyponym of pika; that is, collared pika is a word with a more specific, narrower meaning than pika:

pika: small short-eared burrowing mammal of rocky uplands of Asia and western North America
collared pika: similar to little chief hare and may be same species

Other hyponyms of pika include little chief hare, Ochotona princeps, Ochotona collaris.

pika (noun)	collared pika (noun)
small short-eared burrowing mammal of rocky uplands of Asia and western North America	similar to little chief hare and may be same species