pace vs quickness

pace and quickness both are nouns.

Word	Noun	Adjective	Verb	Adverb
pace	Yes	No	Yes	No
quickness	Yes	No	No	No

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

pace (noun)	quickness (noun)
a step in walking or running	a rate that is rapid
the relative speed of progress or change	intelligence as revealed by an ability to give correct responses without delay
a unit of length equal to 3 feet; defined as 91.44 centimeters; originally taken to be the average length of a stride	skillful performance or ability without difficulty
the distance covered by a step
the rate of moving (especially walking or running)
the rate of some repeating event