Aerograms, a type of lightweight letter that is designed to be sent by airmail, can be known by several synonyms. Some of the common synonyms for aerograms include air letters, air mails, airmail letters, and aeromails. These synonyms are used interchangeably and refer to the same type of mail. Aerograms were a popular way to send letters during the early days of airmail as they were lightweight, compact, and affordable. However, with the advent of technology and the internet, the use of aerograms has declined in recent years and has been replaced by electronic mail and messaging applications.