vial vs ampul

vial and ampul both are nouns.

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

As nouns, vial and ampul are synonyms defined as:

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

Other synonyms of vial include ampoule, ampule, phial.

vial (noun)	ampul (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)