Scrabble Dictionary

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Yes, quilter is playable

...and is worth 18 points.

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OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)

"Quilter" Definition

noun

A person who performs the entire process of making a patchwork quilt, whether or not it is decorated with quilting stitches.
Source: Wiktionary
A person who uses a hand or machine stitch to decorate a quilt, or to sew together the layers of a quilt.
Source: Wiktionary
A person whose hobby or profession is making quilts.
Source: Wiktionary