CORDIS

A CORDIS was the Word Lord equivalent of a TARDIS. CORDIS stood for Conveyance Of Repeating Dialogue In Space-time. (AUDIO: The Word Lord)

Technology
CORDISes ran on common words and phrases used throughout the multiverse and disguised themselves as such, which is called a chameleon meme, their version of a chameleon circuit. The chameleon meme repeats the disguise periodically with the pulses of its engines, for instance, if disguised as a number, forty five, it will be repeated every forty five minutes. It's engines couldn't be hidden by the meme. (AUDIO: A Death in the Family). The Seventh Doctor described CORDISes as a non physical TARDIS.

CORDISes could also provide the Word Lord pilot with anything needed. For instance, when the Seventh Doctor said "Nobody can enter the TARDIS", Nobody's CORDIS was able to transport him into the Doctor's TARDIS. Later, when Nobody said his CORDIS was old and temperamental, it implies the Word Lords experiment with their technology in a similar manner to the Time Lords with their TARDISes.