Mammoth Uncensored Word List:
21 - 14 letter words starting with wa

wafflestompers wagelessnesses walloonophobes walloonophobia walloonophobic wappenschawing wappenshawings warrantability warrantholders wastefulnesses watchfulnesses watercolorists watercolourist waterfloodings waterishnesses waterproofings waterproofness watersaturated watersupplying watertightness waveringnesses