The best replacement for eukaryotes is prokaryotes.

The best alternatives to eukaryotes are rated as following:
★★★★★  prokaryotes
★★★★  bacteria
★★  prokaryotes bacteria
★★  prokaryotes translation
★★  prokaryotes transcription
★★  eukaryotes
★★  archaea
★★  prokaryotes examples
★★  prokaryotes first
★★  prokaryotes dna
★  prokaryotes size
★  prokaryotes reproduction
★  prokaryotes chart
★  prokaryotes mcat
★  prokaryotes diagram
★  prokaryotes similarities
★  prokaryotes wiki
★  prokaryote
  prokaryotic
  autotrophic prokaryotes
  colonial eukaryotes

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Speaking about eukaryotes, one probably shouldn't forget about prokaryotes.

Other search terms related to eukaryotes and their ratings are:
★★★★★ prokaryotes
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