The best replacement for usm is is.

The best alternatives to usm are rated as following:
★★★★★  is
★★★★★  non usm
★★★★  stm
★★  is lens
★★  hsm
★★  ef lens
★  usm ii
★  non-usm lens
★  is canon
★  stm lenses
★  alcorn
★  non usm lens
★  um
★  micro motor
  smart sharpen
  usm
  dc motor
  ud
  non usm lenses
  stm lens
  non-usm
  ef 17-40mm f\/4l usm
  70 200 l
  sigma 50mm f\/1.4 ex dg hsm
  28 135 is usm

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Speaking about usm, one probably shouldn't forget about lens.

Other search terms related to usm and their ratings are:
★★★★★ lens
★★ teleconverter
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Google Trends

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usm
is
non usm