The word acclimatises 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: 22
Highest Scoring Words With Friends™ Play In The Letters acclimatises
:
Seven Letter Word Alert: (42 words)
accites, acclaim, aimless, aliases, ascetic, ascites, atlases, cacemia, calcite, calmest, castile, castles, ciliate, classic, clastic, climate, clitics, elastic, elicits, elitism, icemass, icicles, italics, laciest, lactase, laicise, liaises, malaise, malices, metical, miscast, miscite, misseat, missile, saccate, salamis, sciatic, seismic, silicas, similes, stimies, tamales