The word heartwarming 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: 23
Highest Scoring Words With Friends™ Plays In The Letters heartwarming
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Seven Letter Word Alert: (69 words)
agatine, amentia, angrier, animate, antiwar, arraign, arrange, artware, awaiter, earring, garment, gateman, grainer, granite, granter, hairnet, harming, hearing, heating, herring, ingrate, magenta, magnate, manager, mangier, margate, mariner, marring, martian, megahit, migrant, migrate, minaret, mintage, nametag, narrate, ragtime, raiment, rainhat, rangier, reaming, rearing, reawait, regrant, retrain, righter, tanager, tangier, tangram, tarring, tawnier, teaming, tearing, terrain, thawing, tinware, trainer, trigram, twanger, wargame, warming, warrant, warring, wartier, wartime, wearing, whinger, wireman, wringer