I assume you are referring to the order name lagomorpha (consisting of the animals called lagomorphs). The term comes from the Greek roots lago- (hare) and morph- (form). So obviously the animals in this order include pikas, rabbits, and hares, with approximately eighty species represented.
Some people believe that rabbits/hares are rodents and for a while they were considered such, however, one distinguishing feature is that rodents have a total of four incisor teeth, while lagomorphs possess six (a small pair called "peg teeth" are located behind the upper incisors). Another distinction is that lagomorphs are completely herbivorous, while rodents are more omnivorous, eating both plants and meat.
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