Startest is an archaic form of the word start, which means to begin or commence something. There are many synonyms for the word startest, including commence, initiate, embark, launch, inaugurate, set in motion, kick off, undertake, and take the first step. These words are often used interchangeably, depending on the context and tone of the sentence. For instance, one could say, "We are going to commence the project next week" or "He took the first step to start his own business." Each of these words represents an action to get something going in the right direction.