Enter a clue or pattern or both:
The Clue
Writers' references (8 letter answer)
The Answer
THESAURI
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Notes
The answer THESAURI is so rare that it appears less than once every 2500 puzzles.
Related Clues
Synonym books
Definition
THESAURUS as a noun:
1. (thesaurus, synonym finder) = a book containing a classified list of synonyms