The best replacement for suppressor is silencer.

The best alternatives to suppressor are rated as following:
★★★★★  silencer
★★★★  muzzle brake
★★★  silencer difference
★★★  surge protector
★★★  assault rifle
★★★  compensator
★★  suppressor
★★  oncogene
★★  flash suppressor
★★  protector
★★  heavy barrel
★  flash hider
★  assault rifle halo 4
★  storm rifle
★  r2 suppressor
★  muzzle break
★  long barrel
★  heavy barrel bf3
★  moderator
★  sbr
  silencers
  ar halo 4
  assault rifle halo
  birdcage
  sound moderator
  proto oncogene

Your alternative for suppressor is not listed? Suggest!
Speaking about suppressor, one probably shouldn't forget about subsonic rounds.

Other search terms related to suppressor and their ratings are:
★★★★★ subsonic rounds
★★★ muzzle brake
★★★ battlecomp
★★ subsonic ammo
★★ .22
★★ subsonic
★★ threaded barrel
9mm
.22lr
You have in mind a companion for suppressor and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of suppressor in all years. Click on graph for more.
suppressor
silencer
muzzle brake