Yes, all is playable
					...and is worth 5 points.
			
	
		
		
		
	
	Found in the following dictionaries
	Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"All" Definition
        noun
        	
		The whole of one's possessions, resources, or energy .
		
	 
	
			    pronoun
        	
		Everyone; everything:  justice for all.
		
	 
	
	    	
		The entire or total number, amount, or quantity; totality:  All of us are sick. All that I have is yours.
		
	 
	
			    pronoun, singular or plural in construction
        	
		The whole number, quantity, or amount    .
		
	 
	
			    idiom
        	
		All along  From the beginning; throughout:  saw through the disguise all along.
		
	 
	
	    	
		All but  Nearly; almost:  all but crying with relief.
		
	 
	
	    	
	
	    	
		All in all  Everything being taken into account:  All in all, the criticism seemed fair.
		
	 
	
	    	
		All of  Informal   Not more than:  a conversation that took all of five minutes.
		
	 
	
			    adjective
        	
		Any whatsoever:  beyond all doubt.
		
	 
	
	    	
		Being or representing the entire or total number, amount, or quantity:  All the windows are open. Deal all the cards.  See Synonyms at whole.
		
	 
	
	    	
		Being the utmost possible of:  argued the case in all seriousness.
		
	 
	
	    	
		Constituting, being, or representing the total extent or the whole:  all Christendom.
		
	 
	
	    	
		Every:  got into all manner of trouble.
		
	 
	
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