The correct 5-letter word that serves as a direct synonym for "guarantee" is "pledg" (though more commonly spelled pledge as a verb or noun meaning a binding promise or assurance). Another excellent 5-letter alternative closely related to legal assurances is "assur" (though typically written as assure). In legal or formal contexts, words like "vouch" or "swear" capture similar pledging qualities, though pledge remains the most direct 5-letter lexical match for a formal guarantee.
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