mask / masque 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. 👇
mask: (noun) a covering to disguise or conceal the face. (noun) activity that tries to conceal something. (noun) a protective covering worn over the face. (verb) put a mask on or cover with a mask. (verb) cover with a sauce. (verb) shield from light.
masque: NA
mask: m·AE·s·k
masque: NA
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)