Yes, long is playable
...and is worth 8 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Long" Definition
noun
A garment size for a tall person.
Linguistics A long syllable, vowel, or consonant.
One who acquires holdings in a security or commodity in expectation of a rise in price.
Trousers extending to the feet or ankles.
verb
To feel a strong desire or craving especially for something not likely to be attained .
To be suitable or fitting.
Have a strong wish or desire:.
biographical name
Crawford Williamson 1815–1878 Am. surgeon.
Hu*ey Pierce 1893–1935 Am. polit.
Stephen Harriman 1784–1864 Am. army officer & explorer.
adverb
At a point of time distant from that referred to: That event took place long before we were born.
At or to a considerable distance; far: She walked long past the end of the trail.
Beyond a given boundary, limit, or goal: hit the return long.
During or for an extended period of time: The promotion was long due.
For or throughout a specified period: They talked all night long.
idiom
Long ago A time well before the present: heroes of long ago.
Long ago At a time or during a period well before the present: I read that book long ago.
Long in the tooth Growing old.
No longer Not now as formerly: He no longer smokes.
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