The best replacement for buffer is cache.

The best alternatives to buffer are rated as following:
★★★★★  cache
★★★  polisher
★★★  hootsuite
★★★  burnisher
★★  stream
★  grinder
★  stringbuilder
★  16mb buffer
★  everypost
★  trigg
★  queue
★  string
★  hand wax
★  commercial
★  latch
★  rifle buffer
★  cache memory
  sprout
  h2 buffer
  orbital buffer
  frank trigg
  commercial buffer
  8mb buffer
  more buff
  carbine buffer
  voltage follower
  bruce buffer
  tbe buffer
  no buffer
  michael buffer
  non buffer
  z buffer
  h buffer
  standard buffer
  phosphate buffer

Your alternative for buffer is not listed? Suggest!
Speaking about buffer, one probably shouldn't forget about strong acid.

Other search terms related to buffer and their ratings are:
★★★★★ strong acid
★★ strong acid and strong base
★ rifle upper
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Google Trends

Scale is based on the average worldwide traffic of buffer in all years. Click on graph for more.
buffer
cache
polisher