The word "mamet" does not have any commonly used synonyms. In fact, this word is not commonly used in the English language at all. It is possible that the word you intended to use is "mammoth", which has several synonyms such as huge, colossal, gigantic, massive, and enormous. Alternatively, if you are looking for synonyms for "mamet" as a name, there are none as it is not a commonly used name in any language. It is important to double-check any new or unfamiliar words before using them in a written or spoken context to ensure they are being used correctly.