Translation

The Japanese word for "Beetle" is kouchuu 甲虫.

Romaji ko u chu u
Hiraganaちゅ
Katakanaチュ
Kanji
Meaning Carapace Bug
School Level 小1

Loan-word

The word "Beetle" katakanized would be bītoru ビートル.
Romaji bii to ru
Katakana
Hiragana

Further Reading

Wikipedia: Beetle (甲虫類)