Translation

kokkurōchi means "Cockroach" in English.
It's a katakanization, a loan-word.

kokkurōchi is normally written with katakana, as コックローチ.
kokkurōchi written with hiragana is こっくろーち.
kokkurōchi does not have kanji.
Romaji ko kku roo chi
Katakana
Hiragana

Orthography Notes

Further Reading

Wikipedia: 蜚蠊 (Cockroach)