The best replacement for defrost is thaw.

The best alternatives to defrost are rated as following:
★★★★★  thaw
★★★★★  no frost
★★★  defreeze
★★★  auto defrost
★★★  frost free
★★  automatic defrost freezers
★★  demist
★★  defroze
★★  manual defrost
★  mirror defrost
★  frost free freezer
★  time defrost
★  frost free freezers
★  manual
★  self defrost
  digital inverter
  automatic defrost

Your alternative for defrost is not listed? Suggest!
Speaking about defrost, one probably shouldn't forget about ac on.

Other search terms related to defrost and their ratings are:
★★★★★ ac on
You have in mind a companion for defrost and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of defrost in all years. Click on graph for more.
defrost
thaw
no frost