6. The system of claim 4 and means responsive to said compared means finding that the compared dictionary word is the same as the input word for stopping said search through chain linked said dictionary words and for giving a word recognization signal.
4. A word recognition system comprising input register means for storing input words, each of said words having a length measured in terms of the number of letters in said words and having a head comprised of a predetermined number of letters at the start of the words, dictionary memory means for storing dictionary words in locations which are segregated by word length, hash index table means storing addresses which are indicative of locations in said dictionary memory means, each of said addresses being predetermined in accordance with two letters, address reading means for reading an address from said hash index table means in response to the letters in said head, means for chain linking words in said dictionary word locations into an ordered search sequence according to said address read out by said address reading means, means for comparing each of said input words with said dictionary words of the same length, and means responsive to said comparing means finding that dictionary word is different from a compared input word for searching through said dictionary words in the ordered sequence of said chain linking.