artificial pacemaker vs pacemaker

artificial pacemaker and pacemaker both are nouns.

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

As nouns, artificial pacemaker and pacemaker are synonyms defined as:

artificial pacemaker and pacemaker: an implanted electronic device that takes over the function of the natural cardiac pacemaker

artificial pacemaker (noun)	pacemaker (noun)
an implanted electronic device that takes over the function of the natural cardiac pacemaker	a horse used to set the pace in racing
	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