Fax-modem, the term that refers to a device that combines a modem and a fax machine, has several synonyms that can be used interchangeably. One of them is fax server, which is a networked machine that allows users to send and receive faxes through a computer network. Another synonym for fax-modem is fax machine, a stand-alone device that sends and receives faxes through a phone line. Some of the other alternatives to the term fax-modem include fax gateway, fax board, and fax modem card. These terms represent different types of devices that allow computer systems to communicate with fax machines and send and receive faxes.