The word cementitious 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: 20
Highest Scoring Words With Friends™ Play In The Letters cementitious
:
Seven Letter Word Alert: (50 words)
cements, cenotes, coesite, consume, contest, costume, cuisine, cumenes, emetics, ensuite, entices, eosinic, iconism, iconist, incites, incomes, inosite, intuits, itemise, itemset, meiotic, menisci, minuets, minutes, miocene, miscite, miscoin, mistune, mitiest, mitotic, mittens, moisten, mountie, munites, muscone, notices, octenes, onetime, section, smitten, somitic, suction, teutons, timeout, tiniest, titmice, tuition, tumesce, unities, unstoic