The best replacement for rue is roux.

The best alternatives to rue are rated as following:
★★★★★  roux
★★★★  excelsior
★★★  college network
★★  fenugreek
★★  gilbert
★  bechamel
★  caapi
★  slurry
★  regret
  ruda

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

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

Scale is based on the average worldwide traffic of rue in all years. Click on graph for more.
rue
roux
excelsior