​ Easy:
  1. A city:
  2. An instrument:
  3. A woman's name:
  4. A medical speciality:
  5. a vegetable:
  6. A pastry:
a little difficult: 
  1. A monument:
  2. A tree species:
  3. An animal:
  4. A celebrity's surname:
quite difficult:
  1. A sport:
  2. A book:
  3. A song:
  4. ??????????????????????: Opaque