Hobbs J.B. Homophones and homographs: an American dictionary

Jefferson: McFarland & Co., 2006. — 377 p.This expanded fourth edition defines and cross-references 9,026 homophones and 2,127 homographs. This edition serves well where even the most modern spell-checkers and word processors fail--although rain, reign, and rein may be spelled correctly, the context in which these words may appropriately be used is not obvious to a computer