Here are some examples of words that use the root "ortho-":
* Orthography: The correct spelling of words.
* Orthodontics: The branch of dentistry that deals with straightening teeth.
* Orthopedics: The branch of medicine that deals with correcting deformities of the musculoskeletal system.
* Orthodox: Conforming to established beliefs or practices.
* Orthogonal: Perpendicular or at right angles.