Maybe something like:
Code:
Sub test()
Dim nPages As Long, StrTemp As String
nPages = ActiveDocument.BuiltInDocumentProperties(wdPropertyPages)
Application.ScreenUpdating = False
For x = 1 To nPages
Selection.GoTo What:=wdGoToPage, Which:=wdGoToAbsolute, Count:=x
StrTemp = StrTemp & x & " page - " & ActiveDocument.Bookmarks("\Page").Range.SpellingErrors.Count & vbCr
Next x
Application.ScreenUpdating = True
MsgBox StrTemp
End Sub