There are several synonyms for the term "not all," including "not every," "not entirely," "not completely," and "not wholly." These terms all express a degree of exception or incompleteness in a statement or situation. For example, if someone says "not all dogs like to play fetch," they are indicating that there may be some dogs who do like to play fetch, but not every dog falls into this category. Similarly, if someone says "not all of the books in the library are fiction," they are suggesting that some books may indeed be fiction, but not every book fits this description. These synonyms can be useful for providing nuance and clarity in communication.