The best replacement for autumn is fall.

The best alternatives to autumn are rated as following:
★★★★★  fall
★★★★  spring
★★★★  autumn
★★  what it feels like to fall
★★  winter
★★  mutiny
★  fall difference
★  spring color analysis
★  summer raspberries
  fall british
  galactica
  alexis
  torrie
  summer
  deep winter
  spring colder
  warm autumn
  soft summer

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

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



Google Trends

Scale is based on the average worldwide traffic of autumn in all years. Click on graph for more.
autumn
fall
spring