<p> This expanded fourth edition defines and cross-references 9040 homophones and 2133 homographs (up from 7870 and 1554 in the 3rd ed.).</p><p> As the most comprehensive compilation of American homophones (words that sound alike) and homographs (look-alikes) this latest edition serves well where even the most modern spell-checkers and word processors fail--although <I>rain reign</I> and <I>rein</I> may be spelled correctly the context in which these words may appropriately be used is not obvious to a computer.</p>