noun
a person or thing that moulds or shapes something
verb
to crumble or decay gradually; to cause to crumble or decay
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The moulder carefully crafted the intricate design on the clay vase.
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I saw the moulder working on a new sculpture in the art studio.
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Hey, check out that moulder over there, he's really talented!
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Time seemed to moulder away as she lost herself in the pages of her favorite book.