Translation

The Japanese word for "Bug" is mushi 虫.

  • In English, the word "Bug" refers to any small insect, and even some small animals that aren't insects. A more technical definition, the term "True Bug," refers to animals of the order Hemiptera.[1][2]
  • Broad mushi 虫
    In the past, it was thought that animals were divided into "furries," kemono 獣, fishes, birds, and literally everything else was mushi 虫. Hence why the term is so broad, even today. You can tell an animal was considered to be a mushi because its kanji will have the 虫 radical. For example, "Frogs," kaeru 蛙, and "Snakes", hebi 蛇, don't have fur, so they were considered to be mushi.[3]
Romaji mu shi
Hiraganaむし
Katakanaムシ
Kanji 虫
School Level 小1

Loan-word

The word "Bug" katakanized would be bagu バグ.
Romaji ba gu
Katakanaバグ
Hiraganaばぐ

Trivia

  • The word mushi 虫 can be used to call someone an "Insect" in Japanese, in the insulting way.