pacemaker vs pacesetter

pacemaker and pacesetter both are nouns.

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

As nouns, pacemaker and pacesetter are synonyms defined as:

Other synonyms of pacemaker include pacer.

As nouns, pacemaker and pacesetter are synonyms defined as:

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