The word "backlighted" uses 11 letters: abcdeghiklt.
backlighted is a valid word in this word list. For a definition, see the external dictionary links below.
Try a search for backlighted in these online resources (some words may not be found):
Wiktionary - OneLook Dictionaries - Merriam-Webster - Google Search
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Shorter words found within backlighted
ab abed ace aced ache ached ad ae ag age aged ah ba bach bached bad bade badge bag bah be beach bead bed beg cab cad cade cadge cage caged chad dab dace dag dah de deb each ed edh egad eh gab gad gae gaed ged ha had hade hae haed hag he head