speed vs gradualness

speed and gradualness both are nouns.

Word	Noun	Adjective	Verb	Adverb
speed	Yes	No	Yes	No
gradualness	Yes	No	No	No

As nouns, gradualness is a hyponym of speed; that is, gradualness is a word with a more specific, narrower meaning than speed:

speed: a rate (usually rapid) at which something happens
gradualness: the quality of being gradual or of coming about by gradual stages

Other hyponyms of speed include haste, hastiness, hurriedness, hurry, precipitation, execution speed, graduality.

speed (noun)	gradualness (noun)
changing location rapidly	the quality of being gradual or of coming about by gradual stages
a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression	the property possessed by a slope that is very gradual
a rate (usually rapid) at which something happens
the ratio of the focal length to the diameter of a (camera) lens system
distance travelled per unit time

speed (verb)	gradualness (verb)
move faster
cause to move faster
move very fast
travel at an excessive or illegal velocity
move hurridly