Closer

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Middle English: from Old French clos (as noun and adjective), from Latin clausum ‘enclosure’ and clausus ‘closed’, past participle of claudere .

wiktionary

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closer

From Middle English closere, equivalent to close(verb) +‎ -er.

etymonline

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closer (n.)

"one who or that which closes" anything, 1610s, agent noun from close (v.).