zoster vs herpes zoster

zoster and herpes zoster both are nouns.

Word	Noun	Adjective	Verb	Adverb
zoster	Yes	No	No	No
herpes zoster	Yes	No	No	No

As nouns, zoster and herpes zoster are synonyms defined as:

zoster and herpes zoster: eruptions along a nerve path often accompanied by severe neuralgia

Other synonyms of zoster include shingles.

zoster (noun)	herpes zoster (noun)
eruptions along a nerve path often accompanied by severe neuralgia	a herpes virus that causes shingles
	eruptions along a nerve path often accompanied by severe neuralgia