pacer vs pace

pacer and pace both are nouns.

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

pacer (noun)	pace (noun)
a horse trained to a special gait in which both feet on one side leave the ground together	a step in walking or running
a horse used to set the pace in racing	the relative speed of progress or change
	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