WordNet sense 1 (a small unit serving as part of or as the nucleus of a larger political movement):

cadre

WordNet sense 2 (a hand-held mobile radiotelephone for use in an area divided into small sections, each with its own short-range transmitter/receiver):

cellphone, cellular telephone, cellular phone, mobile phone

WordNet sense 3 (small room is which a monk or nun lives):

cubicle

WordNet sense 4 (a room where a prisoner is kept):

jail cell, prison cell

WordNet sense 5 (a device that delivers an electric current as the result of a chemical reaction):

electric cell