The best replacement for polymer is monomer.

The best alternatives to polymer are rated as following:
★★★★★  monomer
★★★★  lithium ion
★★★  plastic
★★  angular
★★  aluminum lower
★★  steel pool
★  lacquer ammo
★  react
★  macromolecule
★  lithium ion battery
★  angular dart
★  li ion
★  steel frame
★  x-tag
★  steel walls for pools
★  steel pistol
★  forged lower
★  ion
★  steel magazines
★  lithium ion batteries
★  oligomer
★  resin
  steel pools
  wood ak
  copolymer
  1911
  polysaccharide
  glass filled nylon
  carnauba
  react js
  condensation polymer
  aluminum trigger guard
  steel guns
  polymers
  steel inground pools
  ion battery
  steel pool walls
  elastomer
  metal handguns

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Speaking about polymer, one probably shouldn't forget about monomer.

Other search terms related to polymer and their ratings are:
★★★★★ monomer
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Google Trends

Scale is based on the average worldwide traffic of polymer in all years. Click on graph for more.
polymer
monomer
lithium ion