vial / vile / viol are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
vial: NA
vile: NA
viol: (noun) any of a family of bowed stringed instruments that preceded the violin family.
vial: v·AY·ah·l
vile: v·AY·l
viol: NA
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)