The best replacement for cooker is crock pot.

The best alternatives to cooker are rated as following:
★★★★★  crock pot
★★★★★  pressure canner
★★★  slow cooker
★★★  stove
★★★  cook
★★★  oven
★★★  gas stove
★★  canner
★★  steamer
★★  pressure cooker
★  stove top
★  electric
★  hob
★  range
★  gas cooker
★  crockpot
★  built in
★  blueprint
★  dutch oven
  microwave
  autoclave
  water bath
  electric stove
  water bath canner
  lpg gas
  le creuset
  rice cooker
  thermomix
  stove top pressure cooker
  water bath canning
  rice steamer
  thermal cooker
  stovetop pressure cooker
  casserole
  crock pot recipes
  roaster
  pot

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

Other search terms related to cooker and their ratings are:
★★★★★ steamer
★★★ free dipper
★★★ stainless steel inner pot
You have in mind a companion for cooker and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of cooker in all years. Click on graph for more.
cooker
crock pot
pressure canner