agitator

Pronunciation: /ˈædʒɪteɪtə/

The English word “agitator” has 3 meanings listed here.

noun

One who agitates; one who stirs up or excites others, for example political reformers.
An implement for shaking or mixing.
One of a body of men appointed by the army, in Oliver Cromwell's time, to look after their interests.

From agitate + -or.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.