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Synonyms for key
noun
Instrument to open a lock
latchkey, opener, master key, passkey, skeleton key, passe-partout (French). A means of solution
answer, explanation, solution, clue, index, pointer, pivot, hinge, crux, fulcrum, lever, nexus, core, root, taproot, nucleus, earmark, marker, symptom, sign, brand, cipher, code, indicator, blueprint, signboard, tip-off*; see also answer 2.
See key in Webster's New World Roget's A-Z Thesaurus II
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