The lexicographer resides in Dictionary Corner and rules on the validity of words offered by the contestants. Together with the Corner guest, they suggest any superior (or otherwise interesting words) available. Initially rotational, nowadays filled permanently by Susie Dent.
On the show, the illusion that they find these words themselves is maintained, but in reality both are fitted with earpieces. The words are actually found by the show's producers, currently Damian Eadie, or occasionally by other assistants such as Julian Fell during the Series 49 finals - but never by computer.