The word archaebacteria 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: 25
Highest Scoring Words With Friends™ Play In The Letters archaebacteria
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Seven Letter Word Alert: (47 words)
abreact, accrete, acerate, acerbic, arbiter, archaea, archaic, brachia, breathe, breccia, cabaret, catarrh, catcher, caterer, cerebra, charier, charter, cheater, crabier, earache, erratic, etheric, hectare, heretic, hetaera, racecar, rarebit, ratrace, reacher, rebatch, rebater, rebathe, rebirth, rebrace, recache, recatch, rechart, recheat, reciter, recrate, reteach, retrace, teacher, tearier, terrace, trachea, triarch