Yes, crack is playable
					...and is worth 15 points.
			
	
		
		
		
	
	Found in the following dictionaries
	Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Crack" Definition
        noun
        	
		A breaking, harshly dissonant vocal tone or sound, as in hoarseness.
		
	 
	
	    	
		A mental or physical impairment; a defect.
		
	 
	
	    	
		A moment; an instant:  at the crack of dawn.
		
	 
	
	    	
		A partial split or break; a fissure.
		
	 
	
	    	
	
			    verb-intransitive
        	
		Chemistry   To break into simpler molecules by means of heat.
		
	 
	
	    	
	
	    	
		To break without complete separation of parts; fissure:  The mirror cracked.
		
	 
	
	    	
		To change sharply in pitch or timbre, as from hoarseness or emotion. Used of the voice.
		
	 
	
	    	
		To have a mental or physical breakdown:  cracked under the pressure.
		
	 
	
			    phrasal-verb
        	
		Crack down  To act more forcefully to regulate, repress, or restrain:  The police cracked down on speeding.
		
	 
	
	    	
		Crack up  Informal   To experience or cause to experience a great deal of amusement:  really cracked up when I heard that joke.
		
	 
	
	    	
		Crack up  Informal   To have a mental or physical breakdown:  crack up from overwork.
		
	 
	
	    	
		Crack up  Informal   To praise highly:  He was simply not the genius he was cracked up to be.
		
	 
	
	    	
		Crack up  To damage or wreck (a vehicle or vessel):  crack up a plane; crack up a boat.
		
	 
	
			    adjective
        	
		Excelling in skill or achievement; first-rate:  a crack shot; a crack tennis player.
		
	 
	
	    	
		Of superior excellence or ability .
		
	 
	
			    verb-transitive
        	
		Informal   To break open or into:  crack a safe.
		
	 
	
	    	
		Informal   To break through (an obstacle) in order to win acceptance or acknowledgement:  finally cracked the "men-only” rule at the club.
		
	 
	
	    	
		Informal   To open up for use or consumption:  crack a book; cracked a beer.
		
	 
	
	    	
		Informal   To tell (a joke), especially on impulse or in an effective manner.
		
	 
	
	    	
		To break with a sharp snapping sound. See Synonyms at break.
		
	 
	
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