As nouns the difference between pacemaker and pacesetters
is that pacemaker is one who sets the pace in a race, to guide the others while pacesetters is .
pacemaker
English
Noun
(en noun)(wikipedia)
One who sets the pace in a race, to guide the others.
(anatomy) A set of nerves which stimulate the heart to beat.
(hence, medicine) A medical implement that is used to stimulate a heart to beat by simulating the action of the natural pacemaker.