Tip: If you're serious about improving your writing, one of the best ways is to improve your vocabulary — not so you know how to use big words, but so you can choose the right word at the right time to convey your meaning precisely and simply. To improve your vocabulary, we highly recommend you try the popular vocabulary-improvement software called Ultimate Vocabulary. Click Ultimate Vocabulary for details.*
The only other word that A LOT might get confused with is ALLOT, which means "to allocate, or distribute". As in, Our teacher alloted us one chocolate Easter egg each.
The hilarious Hyperbole and a Half blog has a wonderfully funny post with cartoons about "alot", we think you'll get a laugh!
If you use Ultimate Spelling, it can help you to learn the correct spelling of such confusing words.