Dictionary Corner
Dictionary Corner is the collective name for the lexicographer and guest celebrity, whose job is to both verify the contestants' words and suggest longer or interesting words.
Lexicographer
Now exclusively the role of Susie Dent since 6 February 2008, the role of the lexicographer had traditionally been occupied by a member of the Oxford University Press or a member of the show's production team. On-screen, the lexicographer gives the final decision as to whether a word can be allowed or not. See the list of lexicographers.
Celebrity
The guest celebrities help the lexicographer find the longest words and occupy a slot in which they tell amusing anecdotes, perform anagrams, magic (or other tricks) or add general entertainment to the proceedings. Since 25 March 2013, this has between Rounds 6 and 7. The celebrity is typically credited as "Special Guest" in the credits roll. See the list of Dictionary Corner guests.