bug

A fault or error in a computer program or system.

"We found a bug in the new software."

A small insect, often considered a pest or creepy-crawly.

"There's a tiny bug crawling on the wall."

To annoy or bother someone persistently, often with requests.

"Stop bugging me about my homework!"

A mild, often viral, illness or infection, typically affecting the stomach.

"I've caught a nasty stomach bug."