RapidSpellAsYouType includes an autocorrector (which can be disabled by setting RapidSpellAsYouType.AutoCorrectEnabled=false) for English.
The RapidSpellAsYouType.AutoCorrectionMap is a Hashtable linking user entries to substitutions. This can be modified as desired when the form is created.
Eg.
rapidSpellAsYouType1.AutoCorrectionMap["vb"] = "Visual Basic";
In this way, auto correction lists for any language can be used.