Mammoth Uncensored Word List:
19 words that are 16 letters long beginning with w in the mammoth uncensored word list.

waterdispersible waterproofnesses watertightnesses weatherabilities weatherboardings weatherproofness weatherresistant weatherstrippers weatherstripping weathertightness weightlessnesses weltanschauungen whatchamacallits wholeheartedness willingheartedly wondermongerings worshipfulnesses worthwhilenesses wrongheartedness