The best replacement for analyzer is analyser.

The best alternatives to analyzer are rated as following:
★★★★★  analyser
★★★★★  analyst
★★★★  oscilloscope
★★★  master girl
★★  swiftshader
★  network analyzer
★  viewpoint
★  beealyzer
★  sniffer
★  spectrum analyzer
★  scanner
★  polygraph
★  power meter
★  draft dominator
  ring thing
  fiddler
  keyword analyzer
  quality stage
  comskip
  emi receiver
  enterprise manager
  parser
  receiver
  chemistry analyzer
  antenna tuner
  test receiver
  adword analyzer
  vector network analyzer

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Speaking about analyzer, one probably shouldn't forget about oscilloscope.

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

Scale is based on the average worldwide traffic of analyzer in all years. Click on graph for more.
analyzer
analyser
analyst