छन —     छनना —     छानना —

छन  m) moment, instant; f) tinkling/jingling sound 

छनना  v) intransitive verbal form of छानना

छानना  v) filter; strain (colar); sieve (tamizar); screen (cribar)

छाना  v) cover (media); overwhelm (abrumar, aplastar), shadow (tapar, ensombrecer); overspread (extender)