ampul vs vial

ampul and vial both are nouns.

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

As nouns, ampul and vial are synonyms defined as:

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

Other synonyms of ampul include ampoule, ampule, phial.

ampul (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)