The spelchuker can be your friend or not:

Most spellcheckers allow you to add words but don't readily permit the deletion of words that are in the original setup.

Law offices pay extra special big bucks for "legal spellcheckers" in which the principal difference is the DELETION of the word "trail."

I suppose the reason is obvious.

The cheap fix is to set "Autocorrect" to replace "trail" with "trial," but then you have to learn that if you really want the word trail you have to spell it "t r a i l Ctl-Z."

(It's funnier when it's happened to someone you know.)

John