What is a synonym for bug?

The best synonym for "bug" depends on the context. Here are some options:

For insects:

* Insect

* Beetle (if it's a beetle specifically)

* Critter

* Pest

* Creepy crawly

* Bugger (informal)

For errors in software or a system:

* Error

* Fault

* Glitch

* Defect

* Issue

* Problem

* Flaw

For something that bothers or annoys:

* Annoyance

* Nuisance

* Irritation

* Pain

For something that's hidden or difficult to find:

* Secret

* Mystery

* Riddle

* Clue

Choose the synonym that best fits the specific meaning you want to convey.