Yes, string is playable
...and is worth 9 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"String" Definition
noun
A cord usually made of fiber, used for fastening, tying, or lacing.
A series of similar or related acts, events, or items arranged or falling in or as if in a line. See Synonyms at series.
A set of objects threaded together: a string of beads.
Architecture A stringboard.
verb-intransitive
To extend or progress in a string, line, or succession.
To form strings or become stringlike.
adjective
Of or relating to musical instruments .
verb
To move, progress, or lie in a string.
To set out in a line or series .
To extend or stretch like a string .
To remove the strings of .
phrasal-verb
String along Informal To fool, cheat, or deceive.
String along Informal To go along with something; agree.
String along Informal To keep (someone) waiting or in a state of uncertainty.
String out To draw out; prolong.
String up Informal To kill (someone) by hanging.
We love the game of Scrabble®, which is why we created Free Scrabble Dictionary - a simple lookup tool to check if the word you want to play is valid in the game of Scrabble®. At the top of every page, you can enter your word and click "Search Dictionary." We'll let you know whether your word is playable and provide a few definitions as well.