The best replacement for corpus is income.

The best alternatives to corpus are rated as following:
★★★★★  income
★★★★★  grineer
★★★★  galveston
★★  writ of amparo
★★  south padre
★  corpus
  appeal
  corpora

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Speaking about corpus, one probably shouldn't forget about cross.

Other search terms related to corpus and their ratings are:
★★★★★ cross
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corpus
income
grineer