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

kokkuroochi in katakana is コックローチ.
kokkuroochi is not usually written with hiragana.
kokkuroochi does not have kanji.
Romaji ko kku roo chi

Orthography Notes

  • ック contains a small tsu ッ which makes the consonant of the syllable longer.
  • ロー contains a long dash called the prolonged sound mark which makes the vowel of the syllable longer. Because of this, this word may also be romanized as kokkurōchi.
Wikipedia: 蜚蠊


gokiburi ゴキブリ.