Forming the plural of French nouns ending in -al

French words ending in -al have a different ending in the plural form. 

Learn how to form the plural of French nouns ending in -al

Look at these examples:

Note that most nouns ending in -al become -aux in the plural.

But as usual in French, there are some exceptions !

Here is a list of the most common ones:

des bals ([dancing] balls),
des carnavals,
des festivals,
des récitals,
des régals (feasts/delights),
des chacals (jackals)
etc

See also Forming the plural of adjectives ending in -al in French 
and Forming the plural of French adjectives ending in -al (exceptions)