The word "backgrounders" uses 13 letters: abcdegknorrsu.
backgrounders is a valid word in this word list. For a definition, see the external dictionary links below.
Try a search for backgrounders 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 backgrounders
ab abed ace aced ad ae ag age aged ba back backed bad bade badge bag bake baked be bead beak beck bed beg cab cad cade cadge cage caged cake caked dab dace dag dak de deb deck ed egad gab gad gae gaed geck ged ka kab kae kea keg