WordNet sense 1 (tall-stalked very woolly mullein with densely packed yellow flowers; ancient Greeks and Romans dipped the stalks in tallow for funeral torches):

common mullein, Aaron's rod, flannel mullein, great mullein, Verbascum thapsus, woolly mullein

WordNet sense 2 (a small portable battery-powered electric lamp):

flashlight

WordNet sense 3 (a burner that mixes air and gas to produce a very hot flame):

blowtorch, blowlamp