Protest is a show of disagreement or objection to something, and there are several other terms that can be used interchangeably. One example is "demonstration," which refers to the act of showing support or opposition towards an issue in a public gathering or march. "Rally" and "march" are also synonyms, as individuals come together to promote or denounce something. One could "oppose" or "resist" something, which also means to protest. Finally, to "object" or "disagree" could also serve as a synonym for protest, as it means to express one's dissatisfaction towards something. All of these words are effective in describing the act of protesting.