The best replacement for weed eater is edger.

The best alternatives to weed eater are rated as following:
★★★★★  edger
★★★  weed wacker
★★  lawn mower
★★  brush cutter
★★  trimmer
★  weed whacker
★  2 cycle weed eater
★  troy bilt
★  stihl
★  weedeater
★  straight weed eater
★  straight shaft
  curved
  homelite
  black and decker cordless

Your alternative for weed eater is not listed? Suggest!
Speaking about weed eater, one probably shouldn't forget about spool.

Other search terms related to weed eater and their ratings are:
★★★★★ spool
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Google Trends

Scale is based on the average worldwide traffic of weed eater in all years. Click on graph for more.
weed eater
edger
weed wacker