The best replacement for twin is full.

The best alternatives to twin are rated as following:
★★★★★  full
★★★★  twin xl
★★★★  double bed
★★★★  double
★★★  full bed
★★  full size
★★  single bed
★★  full size bed
★★  full mattress
★★  double room
★★  queen
★  single turbo
★  twins
★  toddler bed
  extra long twin
  queen bed
  full bigger
  queen size
  half rope
  single mattress
  xl twin
  inline 4
  double bed size
  single engine aircraft
  twin xl sheets
  twin extra long
  single engine plane
  directional
  twin xl dimensions
  single bed size
  full bed bigger
  v twin
  triplet
  twin
  single shower pump
  retro duo
  directional snowboards
  full mattress size
  fraternal twin
  4 cylinder
  full dimensions
  triple snowmobile
  inline 4 motorcycle
  sportster
  luke vibert
  single engine
  parallel twin
  quad fin
  single cylinder
  double hotel room

Your alternative for twin is not listed? Suggest!
Speaking about twin, one probably shouldn't forget about in a twin.

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



Google Trends

Scale is based on the average worldwide traffic of twin in all years. Click on graph for more.
twin
full
twin xl