Translation

niwatori means "Chicken" in English.

niwatori written with kanji is .
This is a jouyou kanji 常用漢字, taught in junior high, chuugakkou 中学校.
niwatori written with katakana is ニワトリ.
niwatori written with hiragana is にわとり.
Romaji ni wa to ri
Hiragana
Katakana
Kanji
School Level

Synonyms

Scientific name: Gallus gallus domesticus.

Further Reading

Wikipedia: ニワトリ (Chicken)