The word signalisations 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 signalisations
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Seven Letter Word Alert: (46 words)
against, agnosia, agonist, aisling, analogs, anginal, anginas, anglist, anoints, antlion, assails, assigns, atonias, atoning, gliosis, goannas, initial, insists, intagli, lasting, liaison, lignins, linings, listing, loaning, losings, nailing, nations, oligist, sailing, salting, sassing, signals, silting, slating, slogans, soiling, sonatas, stalags, stanols, stoning, tailing, tilings, toiling, tonsils, tossing