Translation

roba means "Donkey" or "Ass" in English.

roba is normally written with katakana, as ロバ.
roba written with hiragana is ろば.
roba written with kanji is 驢馬.
This word contains non-jouyou kanji 常用漢字.
Romaji ro ba
Hiragana
Katakana
Kanji
Meaning Donkey Horse
School Level 小2

Further Reading

Wikipedia: ロバ (Donkey)