Many word processors have other advanced features that help a writer with the mechanics of writing properly. These tools can be instrumental in avoiding common writing mistakes.
Keep in mind that spelling checkers are not perfect, and they cannot catch every mistake. The following poem excerpt points out the problem:
Ode To The Spell Checker I have a spelling checker. It came with my PC. It plane lee marks four my revue, Miss steaks aye can know sea. Eye ran this poem threw it, Your sure reel glad two no. Its vary polished in it's weigh, My checker tooled me sew.
(This poem can be found in its entirety at: http://selma.ucd.ie/~pdurkin/Jokes/spellcheck.html It is attributed to Jerry Zar, the Dean of the Graduate School, NW Ill. U)