A spool is a cylindrical object used for winding and storing thread, yarn, wire, or other flexible materials. It can also be used to store film, tape, or paper. The term 'spool' is derived from the Old English word 'spole, ' which means a round wooden rod. The crossword solutions for the term spool are CYLINDER (8 letters), BOBBIN (6 letters), REEL (4 letters), and pirn (4 letters). A CYLINDER is a three-dimensional shape with two parallel bases that are circular in shape. A BOBBIN is a cylindrical spool used for winding thread, yarn, or other materials. A REEL is a device used for winding and storing flexible materials such as thread, yarn, wire, or film. A pirn is a spool or BOBBIN used for winding thread or yarn.