living dead vs zombie

living dead and zombie both are nouns.

As nouns, living dead and zombie are synonyms defined as:

living dead and zombie: a dead body that has been brought back to life by a supernatural force

Other synonyms of living dead include zombi.

living dead (noun)	zombie (noun)
a dead body that has been brought back to life by a supernatural force	a dead body that has been brought back to life by a supernatural force
	(voodooism) a spirit or supernatural force that reanimates a dead body
	a god of voodoo cults of African origin worshipped especially in West Indies
	someone who acts or responds in a mechanical or apathetic way
	several kinds of rum with fruit juice and usually apricot liqueur