The best replacement for percent is percentage.

The best alternatives to percent are rated as following:
★★★★★  percentage
★★★  per cent
★★★  percentile
★★  percentage point
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★  valid percent
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★  ap style
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★  proof
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★  decimal
★  degrees
★  mla
★  em
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Your alternative for percent is not listed? Suggest!
Speaking about percent, one probably shouldn't forget about calculator.

Other search terms related to percent and their ratings are:
★★★★★ calculator
★★★★ decimal
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percent
percentage
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