lagomorph vs pika

lagomorph and pika both are nouns.

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

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

lagomorph: relative large gnawing animals; distinguished from rodents by having two pairs of upper incisors specialized for gnawing
pika: small short-eared burrowing mammal of rocky uplands of Asia and western North America

Other hyponyms of lagomorph include Duplicidentata, leporid, leporid mammal, coney, cony, mouse hare, rock rabbit.

lagomorph (noun)	pika (noun)
relative large gnawing animals; distinguished from rodents by having two pairs of upper incisors specialized for gnawing	small short-eared burrowing mammal of rocky uplands of Asia and western North America