rock rabbit vs lagomorph

rock rabbit and lagomorph both are nouns.

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

As nouns, lagomorph is a hypernym of rock rabbit; that is, lagomorph is a word with a broader meaning than rock rabbit:

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

Other hypernyms of rock rabbit include gnawing mammal.

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