1. A portable, hand held, machine spelling matching dictionary comprising: power means to provide enabling power, a keyboard having a plurality of keys for entering an input word, said keyboard including an enter key to initiate an entry function when an input word has been designated by said keys, read only memory means having a word list memory, said read only memory means being responsive to said enabling power to provide coupling between said keyboard and said read only memory means in direct response to enabling power, said keyboard having a dedicated key for each letter to permit entry by an operator of a first type of input word composed of a set of letters, validity checking means responsive to the entry of said first type of input word to provide an indication that said first type of input word does or does not match one of the words in said word list memory, to designate said first type of input word as a vallid word or as an invalid word, spelling pattern first matching means to compare said first type of input word when designated as an invalid word against said word list memory to build a first set of selected words meeting a predetermined phonetic spelling matching function, operator actuated override means to override said validity means to provide a phonetic spelling match of a valid input word against the memory, as if said valid input word were not valid, storage means to store said first set of words as selected by said first matching means, a display screen for displaying in sequence each of said words in said storage means, and dedicated scroll key means to scroll through said words in said storage means to display each of said words in sequence on said display screen.