The word alongside 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: 14
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (28 words)
adonise, agonies, agonise, aligned, anodise, dangles, dealign, dealing, denials, dialogs, eloigns, genials, geoidal, goalies, goldens, indoles, ladings, leading, leasing, legions, ligands, lingoes, loading, sealing, sealion, singled, slanged, snailed