Cassette players, once a ubiquitous device for playing and recording music, have now become obsolete. However, we can still use some synonyms for the term cassette players. The most common synonym is "tape recorder," which relates to the device's primary function of recording sound onto cassette tapes. "Boombox" is another synonym for cassette players that often used in the past to describe large, portable stereos with built-in cassette players. "Walkman" was a popular brand of portable cassette players in the 1990s, and it remains synonymous with the device. Finally, "radio cassette" is another term that was commonly used to describe a portable radio with a built-in cassette player.