- pen - a writing implement with a point from which ink flows
--1 is a kind of writing implement
--1 has parts: nib, pen nib
--1 has particulars:ballpoint, ballpoint pen, ballpen, Biro; felt-tip pen, felt-tipped pen, felt tip, Magic Marker; fountain pen; quill, quill pen Derived form: verb pen1 - pen - an enclosure for confining livestock
--2 is a kind of enclosure
--2 has particulars:cow pen, cattle pen, corral; creep; fold, sheepfold, sheep pen, sheepcote; kraal; paddock; pinfold; rodeo; sty, pigsty, pigpen - playpen, pen - a portable enclosure in which babies may be left to play
--3 is a kind of enclosure
- penitentiary, pen - a correctional institution for those convicted of major crimes
--4 is a kind of correctional institution
- pen - female swan
--5 is a kind of swan
- playpen, pen - a portable enclosure in which babies may be left to play