ampoule vs vial

ampoule and vial both are nouns.

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

As nouns, ampoule and vial are synonyms defined as:

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

Other synonyms of ampoule include ampul, ampule, phial.

ampoule (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)