The best replacement for magnitude is intensity.

The best alternatives to magnitude are rated as following:
★★★★★  intensity
★★★  amplitude
★★  richter scale
★★  earthquake pokemon
★★  frequency
★  brightness
★  absolute magnitude
★  dig
★  direction
★  modulus
★  apparent magnitude
★  norm
★  scalar
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Your alternative for magnitude is not listed? Suggest!
Speaking about magnitude, one probably shouldn't forget about vectors.

Other search terms related to magnitude and their ratings are:
★★★★★ vectors
★★★★★ direction
★★ x and y components
★ regard to an earthquake
★ low intensity earthquake
★ 3 vectors
★ earthquakes
You have in mind a companion for magnitude and it is not yet here? Propose!



Google Trends

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magnitude
intensity
amplitude