Here are some examples of words that use this root:
* Doctor: A person who has been taught to treat illnesses and injuries.
* Doctrine: A set of beliefs or principles taught by a person or group.
* Document: A piece of written or printed material that provides information.
* Indoctrinate: To teach someone to accept a set of beliefs uncritically.
* Docile: Easily taught or managed; willing to be taught.
It's important to note that while "doc" is a common root, some words with "doc" may have different origins. For example, "dock" (a place where ships load and unload) comes from the Old English word "docca".