Class List
Here are the classes, structs, unions and interfaces with brief descriptions:

KSpell2 | Kspell_hspellclient.h
BackgroundChecker | BackgroundChecker is used to perform spell checking without blocking the application
Broker | Class used to deal with dictionaries
Client | The fact that this class inherits from QObject makes me hugely unhappy
Dictionary | Class is returned by from Broker
Filter | Filter is used to split text into words which will be spell checked
Word | Structure abstracts the word and its position in the parent text
ASpellDict | Kspell_aspelldict.h
HSpellDict | Kspell_hspelldict.h

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