There are many different synonyms for the term "USPS mails" which can be used when referring to the mail services provided by the United States Postal Service. Some of the most common synonyms include "postal mail," "snail mail," "regular mail," and simply "mail." Other synonyms which may be used in more specific contexts include "package delivery," "priority mail," "media mail," and "certified mail." Regardless of the specific synonym used, the USPS is an essential service in the United States, with millions of Americans relying on their mail services every day for personal and business purposes.