UnScramble this Word: o i n g c v?

Questions

On which river is Warsaw to be found?

Which comedienne's alternative persona is 'Mrs. Merton'?

Three of Shakespeare's plays contain a ghost - Hamlet is one, name either of the others?

Who is famously buried in the churchyard at Bamburgh, Northumberland?

In the grounds of which house is the largest private tomb/mausoleum in England?