The best replacement for frequencies is wavelengths.


The best alternatives to frequencies are rated as following:
★★★★★  wavelengths
★★★★★  relative frequencies
★★★★  pitch
★★★  probabilities
★★  frequencies
★★  proportions
★★  high frequencies

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Speaking about frequencies, one probably shouldn't forget about expected frequencies.

Other search terms related to frequencies and their ratings are:

★★★★★ expected frequencies
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Google Trends

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frequencies
wavelengths
relative frequencies