The best replacement for adder is entity.

The best alternatives to adder are rated as following:
★★★★★  entity
★★★★  cheetah
★★★  viper
★★★  z type
★★★  grass snake
★★  turismo r
★★  coil
★★  turismo
★★  infernus
★★  vacca
★★  asp
★  cheetah gta 5
★  voltaic
★  copperhead
★  entity fx
★  jester
★  voltic
★  slow worm
★  turismo gta 5
★  full adder
★  elegy
★  summing amplifier
  entity xf
  lachesis
  half adder
  mx518
  death adder
  hummingbird
  carbonizzare
  honey badger
  puff adder
  habu

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

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



Google Trends

Scale is based on the average worldwide traffic of adder in all years. Click on graph for more.
adder
entity
cheetah