sluggishness vs pace

sluggishness and pace both are nouns.

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

As nouns, pace is a hypernym of sluggishness; that is, pace is a word with a broader meaning than sluggishness:

Other hypernyms of sluggishness include rate.

sluggishness (noun)	pace (noun)
inactivity; showing an unusual lack of energy	a step in walking or running
the pace of things that move relatively slowly	the relative speed of progress or change
a state of comatose torpor (as found in sleeping sickness)	a unit of length equal to 3 feet; defined as 91.44 centimeters; originally taken to be the average length of a stride
	the distance covered by a step
	the rate of moving (especially walking or running)
	the rate of some repeating event