Synonyms for the term "all parties" could include "all participants", "everyone involved", "all sides", "the entire group", "every party concerned", or simply "everyone". These terms indicate that all individuals or groups involved in a certain situation or event are included in whatever action or decision is being made. It is important to use inclusive language and ensure all parties are being considered when making decisions or assessing a situation. Different synonyms may be more appropriate depending on the context in which the term is being used, but they all convey the same idea of inclusivity and representation of all relevant parties.