different between hurriedness vs rapidity

English

hurried +? -ness

hurriedness (uncountable)

The state of being hurried.
- 1930, Frank Richards, The Magnet, Prout's Lovely Black Eye
  There was a strange agitation in Prout's manner, a strange hurriedness in his tones.

rapid +? -ity, from French rapidité, from Latin rapiditas.

rapidity (countable and uncountable, plural rapidities)

speed, swiftness; the condition of being rapid
(physics) A measure of velocity relative to the speed of light
(physics) A measure of the velocity of a particle in a beam relative to the beam's axis

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