What is another word for demonstrator?
Pronunciation: [dˈɛmənstɹˌe͡ɪtə] (IPA) 
A demonstrator is someone who protests or advocates for a cause. However, there are several other words that can be used interchangeably with this noun. Some of these synonyms include protester, activist, advocate, dissident, agitator, campaigner, and supporter. Each of these words has a slightly different connotation. An activist, for instance, often takes action to effect change, while a supporter may prefer to provide financial or logistical support to a cause. Similarly, a dissident may be someone who opposes the government, while an agitator may be someone who stirs up tension or conflict in order to draw attention to a cause. Regardless of the specific word used, all synonyms for demonstrator imply a passion for justice and a willingness to speak out against perceived wrongs.
