The down side of the spell checker is that you may have spelled the word correctly but it is the wrong word to use in the context that you are "speaking" ie... boarder and border
BOARDER = One who boards, especially:
a. One who pays a stipulated sum in return for regular meals or for meals and lodging.
b. One who goes on board a vessel as part of an assault or military action:
BORDER = 1. A part that forms the outer edge of something.
2. A decorative strip around the edge of something, such as fabric.
3. A strip of ground, as at the edge of a garden or walk, in which ornamental plants or shrubs are planted.
4. The line or frontier area separating political divisions or geographic regions; a boundary.
I use to have a program that not only ran a spell checker but a grammar checker also. When MSWord came out, the grammar checker was eliminated. :(