pen in WordNet English dictionary

1. produce a literary work
   "She composed a poem"; "He wrote four novels"
   write  compose  pen  indite 
   

1. female swan
   pen 
   
2. a writing implement with a point from which ink flows
   pen 
   
3. an enclosure for confining livestock
   pen 
   
4. a correctional institution for those convicted of major crimes
   penitentiary  pen 
   
5. a portable enclosure in which babies may be left to play
   playpen  pen