* 벌레 (beolre): This is the general word for "insect" or "bug." It's the best choice for most situations, like a bug in your house.
* 해충 (haechung): This means "pest" or "harmful insect." Use this if the bug is causing damage or is considered a nuisance.
* 오류 (oryu): This word means "error" or "mistake." This is the word to use when talking about a bug in software or a computer program.
* 바퀴벌레 (bakwibeolle): This specifically means "cockroach."
So, to choose the right word, consider what kind of "bug" you're referring to.