different between unscrambles vs unscrambler

English

unscrambles

unscramble +? -er

unscrambler (plural unscramblers)

That which unscrambles; a device for decoding a scrambled signal.
- 2004, Robert W. Christensen, The Simple Guide to Commercial Diving (page 60)
  Even with the best helium unscrambler it can be difficult to understand all divers, particularly at deeper depths.
- 2012, Fr. Pat Sullivan O.F.M. Cap, Four Years In Castro's Cuba (page 59)
  I more than once saw home-made satellite TV unscramblers being sold on the street in Havana.

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