classify in WordNet English dictionary

1. arrange or order by classes or categories
   "How would you classify these pottery shards--are they prehistoric?"
   classify  class  sort  assort  sort out  separate 
   
2. assign to a class or kind
   "How should algae be classified?"; "People argue about how to relegate certain mushrooms"
   relegate  classify 
   
3. declare unavailable, as for security reasons
   "Classify these documents"
   classify