The crossword solution for the term 'Lighter Part' is 'FLINT'. FLINT is a sedimentary rock that has been used for centuries to create sparks and start fires. It is composed of quartz, mica, and other minerals, and is known for its hardness and ability to produce sparks when struck against steel. FLINT has been used as a fire-starting tool since prehistoric times, and is still used today in many parts of the world.