exemplar vs pacesetter

exemplar and pacesetter both are nouns.

Word	Noun	Adjective	Verb	Adverb
exemplar	Yes	No	No	No
pacesetter	Yes	No	No	No

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

Other hyponyms of exemplar include beaut, beauty, pacemaker, pattern, prodigy.

exemplar (noun)	pacesetter (noun)
something to be imitated	a horse used to set the pace in racing
	a leading instance in its field