The best replacement for roots is twin screw.

The best alternatives to roots are rated as following:
★★★★★  twin screw
★★★★★  centrifugal supercharger
★★★★★  stems
★★★★★  centrifugal
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★  solutions
★  soil roots
★  voodoo
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★  twin screw supercharger
★  underscores
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  vocabulary from classical roots
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  centrifuge
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  screw supercharger
  centrifugal blower
  lysholm
  centrifugal superchargers

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

Other search terms related to roots and their ratings are:
★★★★★ exponents
★★ fractions
★ imaginary numbers
★ rupt
★ branches
★ damaging the tree
erykah badu
multiplicity
john legend
highlights
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roots
twin screw
centrifugal supercharger