reference books

helpful tools

dictionary

A dictionary is a book that list a words of a language in alphabetical order and gives there meaning, or gives the equivalent words in a different language . I personally would use it for a definition of a word.
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encyclopedia

an encyclopedia is a set of books that tell you stuff about a subject. I would use to find out something for a project.
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thesaurus

a thesaurus is a book that lists a words synonym. I would use it to look up a word
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