lighter (n.1)youdaoicibaDictYouDict[lighter 词源字典]
"barge," late 15c., agent noun from light (adj.1), with a sense of lightening a load, or else from Dutch lichter, from lichten "to lighten, unload," on the same notion. They are used in loading or unloading ships that cannot approach a wharf.[lighter etymology, lighter origin, 英语词源]
lighter (n.2)youdaoicibaDictYouDict
"person who lights," 1550s, agent noun from light (v.2).