The best replacement for arc is arch.

The best alternatives to arc are rated as following:
★★★★★  arch
★★★  mig
★★  mig welding
★  ark
★  mig welder
★  plc
★  circa
★  arc
★  dvi
★  aero
★  elliptical
★  linear
★  chord
★  gc
★  tig welding
  levenger
  wire feed welder
  martha stewart
  flux welder
  william the conqueror
  cec
  avc
  check 21
  x10
  iata
  miley cyrus
  mig welders
  spark
  xperia arc s
  clia
  optical cable
  goodwill
  xperia x10
  audyssey
  wire welder
  aids
  angle
  spark path of exile
  arc s

Your alternative for arc is not listed? Suggest!
Speaking about arc, one probably shouldn't forget about hdmi 1.3.

Other search terms related to arc and their ratings are:
★★★★★ hdmi 1.3
★★★★★ hdmi
★★★★ cocos2d
★★★ blocks
★★★ samsung tv
★ central angle
core data
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arc
arch
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