1) Alacrity 2) Expeditiousness 3) Fleetness 4) Haste 5) Immediateness 6) Instancy 7) Instantaneousness 8) Promptitude 9) Promptness 10) Rapidity 11) Speed 12) Velocity 1) French word used in English 2) Haste 3) Pace 4) Quickness 5) Rapidity 6) Rate 7) Speed 8) Swiftness 
• (n.) Rapidity of motion; quickness; swiftness.
Ce·ler'i·ty noun [ Latin celeritas , from celer swiftm speedy: sf. French célérité .] Rapidity of motion; quickness; swiftness. « Time, with all its celerity , moves slowly to him whose whole employment is to watch its flight. Johnson. » 
[n] - a rate that is rapid
celerity Swiftness, speed. Now chiefly (as distinguished from velocity) with reference to the movements or actions of living beings.
The magnitude of WAVE VELOCITY.
quickness noun a rate that is rapid
swiftness; speed.