The best replacement for blocking is nonblocking.

The best alternatives to blocking are rated as following:
★★★★★  nonblocking
★★★★★  unfriending on facebook
★★★  non blocking
★★★  charging
★★  unfriending facebook
★  unfriending
★  hand blocking
★  polling
★  nonblocking switch
★  blocking
★  deadlock
★  bridging
★  holding
★  stratifying
★  power blocking
★  run blocking
★  non-blocking
★  stratification
★  locking
★  man blocking
★  matching
★  deactivating facebook
  zone blocking
  staging
  nonblocking switches
  unfriend
  buffering
  busy waiting
  stratified sampling
  congestion
  pass blocking

Your alternative for blocking is not listed? Suggest!
Speaking about blocking, one probably shouldn't forget about multiple creatures.

Other search terms related to blocking and their ratings are:
★★★★★ multiple creatures
★★★ double strike
★ two creatures
You have in mind a companion for blocking and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of blocking in all years. Click on graph for more.
blocking
nonblocking
unfriending on facebook