Yes, high is playable
...and is worth 10 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"High" Definition
noun
A center of high atmospheric pressure; an anticyclone.
A high level or degree: Summer temperatures reached an all-time high.
Slang An intoxicated or euphoric condition induced by or as if by a drug.
The high gear configuration of a transmission.
adjective
Advanced in development or complexity: high forms of animal life; higher mathematics.
Being at or near the peak or culminating stage: the high tourist season; high summer.
Characterized by lofty or stirring events or themes: high adventure; high drama.
Constituting a climax; crucial: The chase scene is the high point of the film.
Eminent in rank or status: a high official.
adverb
At, in, or to a lofty position, level, or degree: saw a plane high in the sky; prices that had gone too high.
In an extravagant or luxurious way: made a fortune and lived high.
At or to a high place, altitude, level, or degree .
idiom
High and dry In a position of helplessness; stranded: went off and left me high and dry.
High and dry Nautical Out of water. Used of a ship, for example.
High and low Here and there; everywhere: searched high and low for the keys.
On high In a position of authority.
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