Yes, iron 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)
"Iron" Definition
        noun
        	
	
	    	
		A metal appliance with a handle and a weighted flat bottom, used when heated to press wrinkles from fabric.
		
	 
	
	    	
		A silvery-white, lustrous, malleable, ductile, magnetic or magnetizable, metallic element occurring abundantly in combined forms, notably in hematite, limonite, magnetite, and taconite, and used alloyed in a wide range of important structural materials. Atomic number 26; atomic weight 55.845; melting point 1,535°C; boiling point 2,750°C; specific gravity 7.874 (at 20°C); valence 2, 3, 4, 6. See Table at element.
		
	 
	
	    	
		A tonic, pill, or other medication containing iron and taken as a dietary supplement.
		
	 
	
	    	
		An implement made of iron alloy or similar metal, especially a bar heated for use in branding, curling hair, or cauterizing.
		
	 
	
			    phrasal-verb
        	
		Iron out  To settle through discussion or compromise; work out.
		
	 
	
			    verb-transitive
        	
		To fit or clad with iron.
		
	 
	
	    	
		To press and smooth with a heated iron:  iron clothes.
		
	 
	
	    	
		To put into irons; fetter.
		
	 
	
	    	
		To remove (creases) by pressing.
		
	 
	
			    verb-intransitive
        	
	
			    verb
        	
		To furnish or cover with iron.
		
	 
	
	    	
	
	    	
		To smooth with or as if with a heated iron .
		
	 
	
	    	
		To remove (as wrinkles) by .
		
	 
	
	    	
		To smooth or press cloth or clothing with a heated iron.
		
	 
	
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