Translation

kaba means "Hippopotamus" in English.

kaba is normally written with katakana, as カバ.
kaba written with hiragana is かば.
kaba written with kanji is 河馬.
These are jouyou kanji 常用漢字, taught in the fifth year of shougakkou 小学校.
Romaji ka ba
Hiragana
Katakana
Kanji
Meaning River Horse
School Level 小5 小2

Synonyms

Further Reading

Wikipedia: 河馬 (Hippopotamus)