Mammoth Uncensored Word List:
25 words that are 17 letters long beginning with l in the mammoth uncensored word list.

lamellibranchiate laryngopharyngeal laryngotracheitis latitudinarianism lepidopterologies lepidopterologist leptogeosynclinal leptogeosynclines levelheadednesses lexicographically lightfingeredness lighthousekeepers lithoheterotrophs lithoheterotrophy lithostratigraphy longsightednesses lumpenproletariat lymphadenectomies lymphadenopathies lymphangiographic lymphangiosarcoma lymphoepithelioma lymphogranulomata lymphoreticulosis lymphoscintigraph