The word "backwashed" uses 10 letters: aabcdehksw.
backwashed is a valid word in this word list. For a definition, see the external dictionary links below.
Try a search for backwashed in these online resources (some words may not be found):
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Shorter words found within backwashed
aa aah aahed ab aba abed ace aced ache ached ad ae ah aha ahead ba baa baaed bach bached bad bade bah be beach bead bed cab cad cade chad dab dace dacha dah de deb each ed edh eh ha had hade hae haed he head