usable in WordNet English dictionary

1. convenient for use or disposal
   "the house is available after July 1"; "2000 square feet of usable office space"
   available  usable  useable 
   
2. fit or ready for use or service
   "the toaster was still functional even after being dropped"; "the lawnmower is a bit rusty but still usable"; "an operational aircraft"; "the dishwasher is now in working order"
   functional  usable  useable  operable  operational 
   
3. capable of being put to use
   "usable byproducts"
   useable  usable