pen

pen (http://definr.com/pen)

     n 1: a writing implement with a point from which ink flows
     2: an enclosure for confining livestock
     3: a portable enclosure in which babies may be left to play
        [syn: playpen]
     4: a correctional institution for those convicted of major
        crimes [syn: penitentiary]
     5: female swan
     v : produce a literary work; "She composed a poem"; "He wrote
         four novels" [syn: write, compose, indite]