The word friendliness is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 19
Highest Scoring Words With Friends™ Plays In The Letters friendliness
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Seven Letter Word Alert: (57 words)
defiers, defiler, defiles, definer, defines, deifier, deifies, deniers, desires, diesels, dinners, edifier, edifies, eldress, eleidin, endless, felines, fenders, fennels, fielder, finders, finesse, finless, fissile, flensed, flenser, flenses, friends, infidel, infield, inlines, insider, insides, lenders, lindens, linseed, redline, redness, refiled, refiles, refinds, refined, refines, reflies, reified, reifies, reliefs, relined, relines, resends, resides, selfies, senders, sidlers, sinners, slender, sliders