Yes, last is playable
...and is worth 5 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Last" Definition
noun
A block or form shaped like a human foot and used in making or repairing shoes.
Chiefly British A unit of volume or weight varying for different commodities and in different districts, equal to about 80 bushels, 640 gallons, or 2 tons.
One that is at the end or last: the last to be chosen; on every page but the last.
The end: held out until the last.
A form (as of metal or plastic) which is shaped like the human foot and over which a shoe is shaped or repaired.
verb-transitive
To keep adequately supplied: left enough bread to last the family for the weekend.
To mold or shape on a last.
To persist or endure for the entire length of; survive: hoped to last the season without injuring her leg again.
verb
To remain fresh or unimpaired .
To manage to continue (as in a course of action).
To continue in existence or action as long as or longer than .
adjective
Administered just before death: the last sacraments.
Being the latest possible: waited until the last second before boarding the train.
Being the only one left: his last nickel; as a last resort.
Being, coming, or placed after all others; final: the last game of the season.
Highest in extent or degree; utmost: to the last measure of human endurance.
adverb
After all others in chronology or sequence: arrived last.
At the end; finally: Add the butter last.
Most recently: a fashion last popular in the 1940s.
After all others at the end .
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