The word southernmost 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 southernmost
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Seven Letter Word Alert: (71 words)
entrust, estrous, estrums, homerun, honours, hormone, hornets, hotness, hunters, mentors, meronts, monster, moorhen, mothers, mottoes, mounter, mousers, mushers, musters, mutters, noosers, nostrum, nutters, oestrus, onerous, onshore, osteons, ousters, outmost, outsets, outshot, remount, reshoot, sermons, shmoose, shooter, shorten, shouter, shunter, shutter, smooths, smother, snotter, sooners, soonest, soother, soothes, sourest, sternum, stetson, stoners, stouter, stunter, sunroom, tensors, teutons, thermos, thrones, thrusts, tonsure, tooters, torment, tornote, toruses, touters, unhorse, unrests, unsorts, urnmoss, urosome, utmosts