Spackle

google

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1920s: perhaps a blend of sparkle and German Spachtel ‘putty knife, mastic’.

wiktionary

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From Spackle, originally a brand name, perhaps based on spachtel which is ultimately from Latin spatula.

etymonline

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Spackle (n.)

proprietary name for a surfacing compound, 1927, probably based on German spachtel "putty knife, mastic, filler." The verb is attested from 1940. Related: Spackled; spackling.