noun
dominator
DAH-muh-nay-ter/ˈdɑməˌneɪtər/
A person, team, or thing that controls or overwhelms others.
The wrestler is the dominator of the contest, holding the opponent in a secure pin.

Etymology
The verb for ruling combines with an ending naming the doer, giving “one who rules.” That original ruler sense underlies the broader application to a person or thing that controls or overpowers others.
In context
with a dominator or in a dominated situation.
More examples
- The company is the industry's biggest dominator, controlling most sales.
- She becomes the dominator of every discussion, leaving others little chance to speak.
- The tournament's usual dominators both lose in the first round.
Forms
dominator · dominators
dominate verb — To control or overwhelm others.
domination noun — The exercise of control over others.
Similar words
- ruler
- Usually governs people or territory rather than merely overpowering competitors.
- powerhouse
- Emphasizes exceptional strength or ability, not necessarily control over others.