Class, sort (4)
I believe the answer is:
type
I believe this is a double definition.
'class' is the first definition.
(both can mean a variety or kind)
'sort' is the second definition.
(I know that type is a type of sort)
(Other definitions for type that I've seen before include "Mark" , "Print - classification" , "Stamp" , "Category; use keyboard" , "get words on to paper?" .)