1. (Common Noun) large, chiefly aquatic herbivorous mammal having thick, dark, almost hairless skin, short legs with four toes, and a broad, wide-mouthed muzzle

English: hippo, hippopotamus, Hippopotamus amphibius_sci ,
Assamese: জলহস্তী,
Bodo: दैनि मैदेर,
Meeteilon: eshing shamu,
Karbi: langaphak,
Nagamese: pani-hatee,
Bangla: হিপ্পো

Related Idea:

a. Common Noun: sea cow, sirenia...