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"dictionary" is also used as a crossword clue. If that's what you saw, the answer is often wordbook (8 letters).
Definitions
a reference book containing an alphabetical list of words with information about them
Word origin
From Middle English dixionare, a learned borrowing from Medieval Latin dictiōnārium, from Latin dictiōnārius, from dictiō (“a speaking”), from dictus, perfect past participle of dīcō (“to speak”) + -ārium (“room, place”). By surface analysis, diction + -ary.
Used in a sentence
“If you want to know the meaning of a word, look it up in the dictionary.”
“a law dictionary”
“a dictionary of sports”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Lexicon”10 letters
02“Word reference”10 letters
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