As nouns the difference between pacemaker and peacemaker
is that pacemaker is one who sets the pace in a race, to guide the others while peacemaker is a person who restores peace, especially by settling disputes.
As a proper noun Peacemaker is
an early type of American revolver, particularly the Colt 1873 Single Action Army model.
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.
peacemaker
Noun
(
en noun)
A person who restores peace, especially by settling disputes.