The best replacement for speed is velocity.

The best alternatives to speed are rated as following:
★★★★★  velocity
★★★  time graph
★★  time
★  acceleration
★  distance
★  bandwidth
★  power
★  torque
★  adderall
★  pace
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Your alternative for speed is not listed? Suggest!
Speaking about speed, one probably shouldn't forget about endurance.

Other search terms related to speed and their ratings are:
★★★★★ endurance
★ air resistance
★ acceleration
★ powerboost
★ distance and time
changing pitch
You have in mind a companion for speed and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of speed in all years. Click on graph for more.
speed
velocity
time graph