Barril vs. barrica vs. tonel

In the Spanish language, words 'barril', 'barrica', and 'tonel' are commonly used to denote terms around 'barrel' or 'cask'. Though they share a similar theme of storage, there are slight nuances and specific uses related to each term.

Barril

Barril generally refers to a round, usually wooden container, with curved sides used for storing liquids, particularly alcoholic beverages like beer or wine.
El barril de cerveza está lleno.
(The barrel of beer is full.)
Compramos un barril de vino para la fiesta.
(We bought a barrel of wine for the party.)

Barrica

Barrica is more specifically used for barrels that store, age, and enhance the taste of wine or spirits. While it also refers to a wooden barrel, its use is mostly contextually specific to wine-making industry.
La barrica de roble da un sabor distintivo al vino.
(The oak cask gives a distinctive taste to the wine.)
El enólogo giró la barrica para mezclar el vino interiormente.
(The winemaker turned the cask to mix the wine inside.)

Tonel

Tonel is a generic term used for large barrels or vessels used for storage or transport of liquids. It's generally larger compared to 'barril' but its usage varies by region and context.
El tonel de agua está casi vacío.
(The water barrel is almost empty.)
El vino se almacena en un tonel grande antes de ser embotellado.
(The wine is stored in a large cask before being bottled.)

Summary

Whilst barril, barrica and tonel all refer to containers used for storing liquids, their use can depend on the type of liquid or industry they are associated with and also their size variation as well as regional preferences.