Translation

The Japanese word for "Butterfly" is chou チョウ.

Romaji cho u
Hiraganaちょ
Katakanaチョ
Kanji
School Level

Loan-word

The word "Butterfly" katakanized would be batafurai バタフライ.
Romaji ba ta fu ra i
Katakana
Hiragana

Further Reading

Wikipedia: Butterfly (チョウ)
  1. バタフライ - ja.wikipedia.org, accessed .