Answer: dictionaries

AnswerCrossword Clue
DICTIONARIESReference books.
DICTIONARIESLexicons
dictionariesA book that lists the words of a language in alphabetical order and gives their meaning, or that gives the equivalent words in a different language
dictionariesA reference book on any subject, the items of which are arranged in alphabetical order
dictionariesDICTIONARY, a book containing the words of a language alphabetically arranged, with their meanings, etymology, etc