The best replacement for un is una.

The best alternatives to un are rated as following:
★★★★★  una
★★★★  non
★★★  uno
★★★  nato
★★★  ul
★★★  une
★★  in
★★  vatican
★  el
★  dis
★  eu
★  league of nations
★  u.n
★  in prefix
  ln
  catholic church
  unc threads
  de
  na
  nra
  psy
  le
  une french
  united nations
  u n

Your alternative for un is not listed? Suggest!
Speaking about un, one probably shouldn't forget about finland.

Other search terms related to un and their ratings are:
★★★★★ finland
★★ dennis rodman
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una
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