The best replacement for ordinary income is capital gain.

The best alternatives to ordinary income are rated as following:
★★★★★  capital gain
★★★★★  capital gains
★★★★  earned income
★★★  capital income
★★  capital gain tax
★★  compensation income
★★  investment income
★★  dividend income
★★  operating income
★  capital gains tax
★  passive income
★  statutory income
★  capital gain property
  long term capital gains
  short term capital gains
  capital gain income
  short term capital gain

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Speaking about ordinary income, one probably shouldn't forget about capital loss.

Other search terms related to ordinary income and their ratings are:
★★★★★ capital loss
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ordinary income
capital gain
capital gains