lighter, light, igniter, ignitor
['stopwatch, stop watch', 'rule, ruler', 'jean, blue jean, denim', 'handkerchief, hankie, hanky, hankey', 'coil, spiral, volute, whorl, helix', 'Polaroid camera, Polaroid Land camera', 'backpack, back pack, knapsack, packsack, rucksack, haversack']