Is creaser a word in the Scrabble Dictionary

Yes, creaser is playable

...and is worth 10 points.

Found in the following dictionaries

Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)

"Creaser" Definition

noun

A tool for making creases or beads, as in sheet iron, or for rounding small tubes.
A tool for making the band impression distinct on the back.
A tool, or a sewing-machine attachment, for making lines or creases on leather or cloth, as guides to sew by.