The word subheadings 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 subheadings
:
Seven Letter Word Alert: (32 words)
abusing, anguish, badness, bashing, beading, bedungs, biassed, bighead, bigness, budgies, bushing, bussing, dashing, daubing, degauss, designs, gaudies, geishas, gnashed, gnashes, guineas, gussied, heading, husband, sashing, shading, snudges, subhead, subside, sudsing, sunbeds, sundaes