rhinoceros vs rhino

rhinoceros and rhino both are nouns.

Word	Noun	Adjective	Verb	Adverb
rhinoceros	Yes	No	No	No
rhino	Yes	No	No	No

As nouns, rhinoceros and rhino are synonyms defined as:

rhinoceros and rhino: massive powerful herbivorous odd-toed ungulate of southeast Asia and Africa having very thick skin and one or two horns on the snout

rhinoceros (noun)	rhino (noun)
massive powerful herbivorous odd-toed ungulate of southeast Asia and Africa having very thick skin and one or two horns on the snout	massive powerful herbivorous odd-toed ungulate of southeast Asia and Africa having very thick skin and one or two horns on the snout