The best replacement for peer is pier.

The best alternatives to peer are rated as following:
★★★★★  pier
★★★★  client server
★★★  seed
★★★  colleague
★★  peer
★★  server based
★  server
★  subordinate
★  client server networks
★  client server network
  coworker
  pennetta
  friend asterisk
  safarova
  access point
  chakvetadze
  wickmayer
  co worker
  dedicated server
  server client
  client server architecture
  supervisor
  server based network
  infrastructure
  server network

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Speaking about peer, one probably shouldn't forget about peer.

Other search terms related to peer and their ratings are:
★★★★★ peer
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Google Trends

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peer
pier
client server