Yes, flush is playable
...and is worth 12 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Flush" Definition
noun
A bird or flock of birds that has been frightened from cover.
A blush or glow: "here and there a flush of red on the lip of a little cloud” ( Willa Cather).
A brief sensation of heat over all or part of the body.
A flooding flow or rush, as of water.
A reddening of the skin, as with fever, emotion, or exertion.
adjective
Arranged with adjacent sides, surfaces, or edges close together: a sofa flush against the wall. See Synonyms at level.
Designed to be emptied or cleaned by flushing: a flush toilet.
Direct, straightforward, or solid: knocked out by a flush blow to the jaw.
Having a healthy reddish color; flushed.
Having an abundant supply of money; affluent. See Synonyms at rich.
adverb
So as to be even, in one plane, or aligned with a margin.
Squarely or solidly: The ball hit him flush on the face.
verb-intransitive
To be emptied or cleaned by a rapid flow of water, as a toilet.
To dart out or fly from cover.
To flow suddenly and abundantly, as from containment; flood.
To glow, especially with a reddish color: The sky flushed pink at dawn.
To turn red, as from fever, embarrassment, or strong emotion; blush.
verb-transitive
To cause to redden or glow.
To clean, rinse, or empty with a rapid flow of a liquid, especially water: flush a toilet; flush a wound with iodine.
To drive or force into the open: The police fired tear gas to flush out the terrorists.
To excite or elate: The team was flushed with the success of victory.
To frighten (a game bird, for example) from cover.
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