is christmas a noun

Yes, Christmas is a noun. It is a name for the celebration of the birth of Jesus Christ, observed on December 25th in most countries. The word "Christmas" comes from the Old English phrase "Cristes maesse", which means "Christ's Mass" or "the Mass of Christ". The term "Christmas" has become synonymous with the season of holiday festivities, including gift-giving, decorations, and special meals. The word "Christmas" is also used as a proper noun to refer to the holiday itself, such as "I love Christmas!" or "We're celebrating Christmas this year."