Yes, speak is playable
...and is worth 12 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Speak" Definition
verb-transitive
Nautical To hail and communicate with (another vessel) at sea.
To articulate in a speaking voice: spoke words of wisdom.
To converse in or be able to converse in (a language): speaks German.
To convey by nonverbal means: His eyes spoke volumes.
To express aloud; tell: speak the truth.
idiom
Speak down to To speak condescendingly to: She never spoke down to her audience.
phrasal-verb
Speak out To talk freely and fearlessly, as about a public issue.
Speak up To speak loud enough to be audible.
Speak up To speak without fear or hesitation.
verb-intransitive
To act as spokesperson: spoke for the entire staff.
To be expressive: spoke with her eyes.
To be on speaking terms: They are no longer speaking.
To convey a message by nonverbal means: Actions speak louder than words.
To convey thoughts, opinions, or emotions orally.
verb
To utter words or articulate sounds with the ordinary voice .
To express thoughts, opinions, or feelings orally.
To be friendly enough to engage in conversation .
To express oneself before a group.
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