Here are some examples of words with this root:
* Oral: Relating to the mouth.
* Oral cavity: The space within the mouth.
* Oral hygiene: Practices to maintain the health of the mouth.
* Oral communication: Communication using spoken words.
* Orifice: An opening, especially one in the body, such as the mouth.
* Exordium: The beginning or introduction, especially of a speech. (Latin for "beginning from the mouth").
Let me know if you have any other questions!