Validation Vs verification
A spell checker can only check that a word is valid, it cannot verify that it is the word you want. Well, it can be programmed to know that some words tend to follow others (i.e 'would have' and not 'would of') but bringing these things to the user's attention can irritate them, much like the green squiggly lines in MS Word.
The Google keyboard for Android will often substitute a correctly typed rare word for the note common word it *thinks* you want. If you type the word 'manger' and quickly press space, it will substitute the more commonly used word 'manager', but if you pause for half a second before pressing space then it will keep 'manger'.
It's a bit smarter than the classic T9 "are you coming down the sub for a riot?" *pub *pint.
Biting the hand that feeds IT
