The term "the four hundreds" can refer to the time period between 400 AD and 499 AD, or it can refer to a group of 400 items or objects. However, there are several synonyms that can be used to describe this concept, depending on the context. For example, instead of saying "the four hundreds," you could use the term "the 5th century" to refer to the time period. Similarly, instead of saying "400 items," you could use words like a "quadruple hundred" or "four centenary" to describe the group of objects. Other synonyms include "four hundred-piece," "four hundred-strong," or "a four hundred convoy".