Here are some common words containing "turb" and their root words:
* Turbine: The root word is turbine, which comes from the Latin word turbo meaning "whirl" or "spinning."
* Turbulence: The root word is turbulence, which comes from the Latin word turbulentus meaning "agitated" or "disturbed."
* Turban: The root word is turban, which comes from the Persian word durarban meaning "head-binding."
Therefore, the root word of "turb" depends on the specific word it's a part of.