For a while is a common phrase used in daily communication to indicate a temporary period of time. Some synonyms that can replace this phrase could be "temporarily," "briefly," "momentarily," "temporarily," "provisionally," "fleetingly," "for a moment," and "temporarily." These synonyms express the same idea of a short period without suggesting a specific time frame. Using appropriate synonyms can add more clarity and variation to your writing, making it more engaging and enjoyable for the readers. Additionally, using synonyms can also help to avoid repetition and monotony in your text, making it more professional and attractive.