Diversity; difference (7)
I believe the answer is:
variety
I believe this is a double definition.
'diversity' is the first definition.
(I know that diversity can be written as variety)
'difference' is the second definition.
(I know that variety is a type of difference)
(Other definitions for variety that I've seen before include "Diversification" , "Diversity in old music hall?" , "Difference" , "kind of show" , "Kind (of entertainment?)" .)