pacemaker vs exemplar

pacemaker and exemplar both are nouns.

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

As nouns, exemplar is a hypernym of pacemaker; that is, exemplar is a word with a broader meaning than pacemaker:

Other hypernyms of pacemaker include example, good example, model.

pacemaker (noun)	exemplar (noun)
a horse used to set the pace in racing	something to be imitated
an implanted electronic device that takes over the function of the natural cardiac pacemaker
a specialized bit of heart tissue that controls the heartbeat
a leading instance in its field