ampule vs vial

ampule and vial both are nouns.

Word	Noun	Adjective	Verb	Adverb
ampule	Yes	No	No	No
vial	Yes	No	No	No

As nouns, ampule and vial are synonyms defined as:

ampule and vial: a small bottle that contains a drug (especially a sealed sterile container for injection by needle)

Other synonyms of ampule include ampoule, ampul, phial.

ampule (noun)	vial (noun)
a small bottle that contains a drug (especially a sealed sterile container for injection by needle)	a small bottle that contains a drug (especially a sealed sterile container for injection by needle)