The best replacement for thesis is dissertation.

The best alternatives to thesis are rated as following:
★★★★★  dissertation
★★★  non thesis
★★  hypothesis
★★  genesis
★★  topic
★  antithesis
★  topic sentence
★  claim
★  project
★  theses
★  theme
★  research paper
★  non thesis option
★  headway
★  thesis
★  research
★  comprehensive exam
  non-thesis
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  essay
  theory
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  master\u0027s thesis
  toshiki
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  abstract
  masters thesis
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  professional paper
  purpose
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  multiregional thesis
  doctoral dissertation
  yamey thesis

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Speaking about thesis, one probably shouldn't forget about abstract.

Other search terms related to thesis and their ratings are:
★★★★★ abstract
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