Yes, go is playable
...and is worth 4 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Go" Definition
Word Fact:
"Go!" is the shortest grammatically correct sentence in English.
noun
A Japanese game for two, played with counters on a board that is ruled with 19 vertical and 19 horizontal lines.
An attempt; an effort: had a go at acting.
Informal Energy; vitality: had lots of go.
Informal Informal A situation in which planned operations can be effectuated: The space mission is a go.
idiom
Flames To be utterly destroyed.
From the word go From the very beginning.
Go all the way Slang To have sexual intercourse.
Go back on To fail to honor or keep: go back on a promise.
Go belly up Informal To undergo total financial failure: "A record number of . . . banks went belly up” ( New Republic).
phrasal-verb
Go about To set about to do; undertake: Go about your chores in a responsible way.
Go along To cooperate: They get along by going along.
Go around To go here and there; move from place to place.
Go around To have currency: rumors going around.
Go around To satisfy a demand or requirement: just enough food to go around.
adjective
Informal Functioning correctly and ready for action: All systems are go.
Functioning properly being in good and ready condition .
verb-intransitive
Informal To begin an act: Here goes!.
Informal To excrete waste from the bladder or bowels.
Informal Used as an intensifier when joined by and to a coordinate verb: She went and complained to Personnel.
To be a contributing factor: It all goes to show us that the project can be completed on time.
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.