Thomsworld was a planet in or near the boundaries of the Federation.
In 2328, the Thomsworld Spaceport was a frequent destination of transport ships. This information was part of a commercial passenger manifest database recorded in Federation records reviewed by Data in 2370. (TNG: "Inheritance")
This planet only appeared mentioned in an okudagram on a viewscreen visible in freeze frame.
It was named for special effects artist Wil Thoms