Is flack a word in the Scrabble Dictionary

Yes, flack is playable

...and is worth 16 points.

Found in the following dictionaries

Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)

"Flack" Definition

noun

A press agent; a publicist.
Variant of flak.
One who provides publicity.

verb

To provide publicity engage in press-agentry.

verb-transitive

To act as a press agent for; promote: authors who tour the country flacking their books.

verb-intransitive

To act as a press agent: flacking for a movie studio.