What kind of writing and behaviour gets called 'vulgar' and how does 'vulgar' relate to the word 'common'? The Verb explores the power of both words: their power to hurt and shame, the way they help, hinder and enlighten us - and asks whether we can do without them.

Poets Philip Gross, Jacqueline Saphra, Heather Phillipson (the next artist to be curating the Fourth Plinth in Trafalgar Square) and writer Cathy Rentzenbrink join Ian McMillan.

Producer: Faith Lawrence