#wordbook  a reference book containing words (usually with their meanings)
  supertype:  #reference_book__referencebook__reference__reference_work__referencework__book_of_facts  a book to which you can refer for authoritative facts; "he contributed articles to the basic reference work on that topic"
  subtype:  #dictionary__lexicon  a reference book containing an alphabetical list of words with information about them
     subtype:  #bilingual_dictionary__bilingualdictionary  a dictionary giving equivalent words in two languages
     subtype:  #desk_dictionary__deskdictionary__collegiate_dictionary  an abridged dictionary of a size convenient to hold in the hand
     subtype:  #etymological_dictionary  a dictionary giving the historical origins of each word
     subtype:  #gazetteer  a geographical dictionary (as at the back of an atlas)
     subtype:  #learner's_dictionary__learner'sdictionary__schooldictionary  a dictionary specially written for those learning a foreign language
     subtype:  #pocket_dictionary__little_dictionary  a dictionary that is small enough to carry in your pocket
     subtype:  #spell-checker__spellchecker__spelling_checker  an electronic dictionary in a word processor that can be used to catch misspelled words
     subtype:  #unabridged_dictionary  a dictionary that is claimed to be complete
        subtype:  #Oxford_English_Dictionary__O.E.D.__OED  an unabridged dictionary constructed on historical principles
  subtype:  #onomasticon  a list of proper nouns naming persons or places
  subtype:  #vocabulary  a listing of the words used in some enterprise
  subtype:  #glossary__gloss__glos  an alphabetical list of technical terms in some specialized field of knowledge; usually published as an appendix to a text on that field
  subtype:  #thesaurus__thesauru__synonym_finder__synonymfinder  a book containing a classified list of synonyms
     subtype:  #word_finder  a thesaurus organized to help you find the word you want but cannot think of

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