The best replacement for metal is shingle roof.

The best alternatives to metal are rated as following:
★★★★★  shingle roof
★★★  medal
★★★  wood studs
★★★  rap
★★  nonmetal
★★  wood bats
★★  steel
★★  ceramic braces
★  punk
★  clear braces
★  glass pipe
★  plastic
★  pop
★  plastic electrical boxes
★  non metal
★  plastic glasses
★  ikea
★  asphalt roof
★  wood pizza peel
★  wood shed
★  metalloid
★  wood framing
★  heavy metal
  glass slide
  dugem
  plastic water bottle
  plastic eyeglass frames
  shingle roof cost
  plastic snow shovel
  wood drill bit
  glass pans baking
  asphalt roofing
  black metal
  flex ductwork
  metalcore
  molded baseball cleats
  shingle roofing
  ceramic flat irons
  wood bed frame
  wood snare
  glass pans
  wooden bats
  black cloud
  resin brake pads
  asphalt shingles
  rubber valve stems
  plastic rake
  plastic culvert
  shingle
  invisalign braces
  porcelain crown
  emo
  plastic water bottles
  rock
  glass pipes
  graphite shafts
  glass baking dish
  ceramic hip replacement
  non-metal
  plastic sheds
  plastic gas can
  death metal

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

Other search terms related to metal and their ratings are:
★★★★★ dubstep
★★★ welding
★★ rust
★★ dilute nitric acid
★★ specific heat
★★ bagpipes
★ sparks
You have in mind a companion for metal and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of metal in all years. Click on graph for more.
metal
shingle roof
medal