The word intermarriage 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™ Play In The Letters
Seven Letter Word Alert: (92 words)
agamete, agatine, airtime, amentia, angrier, animate, arenite, arraign, arrange, earring, emanate, emirate, garment, gateman, gatemen, germane, germier, grainer, granite, grantee, granter, greaten, greater, grimier, igniter, imagine, inerter, inertia, ingrate, integer, interim, magenta, magnate, manager, manatee, mangier, margate, mariner, marrier, marring, martian, martini, matinee, meagrer, meatier, meeting, merrier, migrant, migrate, minaret, miniate, mintage, mintier, miterer, nametag, narrate, ragtime, raiment, rainier, rangier, reagent, reaming, rearing, regimen, regrant, regrate, reigner, reimage, reinter, retimer, retirer, retrain, tanager, tangier, tangram, tarrier, tarring, teaming, tearier, tearing, teeming, termini, terrain, terrane, terrier, tiering, trainee, trainer, treeing, triaene, trigram, trireme