hippopotamus vs hippo

hippopotamus and hippo both are nouns.

Word	Noun	Adjective	Verb	Adverb
hippopotamus	Yes	No	No	No
hippo	Yes	No	No	No

As nouns, hippopotamus and hippo are synonyms defined as:

hippopotamus and hippo: massive thick-skinned herbivorous animal living in or around rivers of tropical Africa

Other synonyms of hippopotamus include Hippopotamus amphibius, river horse.

hippopotamus (noun)	hippo (noun)
massive thick-skinned herbivorous animal living in or around rivers of tropical Africa	massive thick-skinned herbivorous animal living in or around rivers of tropical Africa