There are various synonyms for the term "four hundreds". The most common synonyms include 'four hundred', '400' and 'quad-centennial'. Other synonyms for "four hundreds" may include 'quad-bicentennial', 'four centuries', and 'four one hundreds'. Additionally, you could also use phrases such as 'four times one hundred', 'four sets of one hundred' or 'a bundle of four hundred'. It is important to keep in mind that the meaning of "four hundreds" may vary based on the context in which it is used. For instance, it may refer to a quantity of four hundred or a period of four hundred years depending on the sentence structure.