The word dynamometer 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: 21
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (26 words)
amender, ammeter, anymore, deanery, demonym, dormant, draymen, meadery, meander, memento, meronym, metamer, metonym, moneyed, mordant, mordent, myomere, reamend, remated, renamed, roadmen, tonearm, trammed, yardmen, yearend, yearned