vial vs ampoule

vial and ampoule both are nouns.

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

As nouns, vial and ampoule are synonyms defined as:

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

Other synonyms of vial include ampul, ampule, phial.

vial (noun)	ampoule (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)