Check Plus combines Spell Check, Word Check, and The American Heritage Abbreviations Dictionary, Third Edition, in a handsome and sturdy slipcase. Spell Check is a handy and up-to-date guide to the correct spelling of 40,000 commonly misspelled words. Word Check is a compact thesaurus that discusses 3,000 synonyms in easy-to-read paragraphs. The American Heritage Abbreviations Dictionary, Third Edition, presents some 20,000 acronyms and abbreviations including cyberspeak.