Cavia porcellus vs cavy

Cavia porcellus and cavy both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cavia porcellus	Yes	No	No	No
cavy	Yes	No	No	No

As nouns, cavy is a hypernym of Cavia porcellus; that is, cavy is a word with a broader meaning than Cavia porcellus:

Cavia porcellus: South American cavy; possibly ancestral to the domestic guinea pig
cavy: short-tailed rough-haired South American rodent

Cavia porcellus (noun)	cavy (noun)
South American cavy; possibly ancestral to the domestic guinea pig	short-tailed rough-haired South American rodent