Final answer:
Words containing a root word related to 'rule' include those with the Latin-derived root 'reg', such as 'regulate', 'regent', and 'regnant'.
Step-by-step explanation:
The question involves identifying words that contain a root related to "rule". To determine this, it is helpful to look at the components of each word, specifically any prefixes or suffixes, and then to identify the root word within. Words that are typically related to "rule" will include roots like reg, which comes from the Latin word meaning "to rule" or "guide". Examples of such words would include regulate, regent, and regnant. These words contain the root reg, which refers to rule.