The synonyms for Christmas include Yule, Noel, Yuletide, Christmastide and the Nativity. Some of these words reference activities related to Christmas as well as Christmas itself.
"Noel" defines not only the day of Christmas but the season of Christmas. Additionally, it refers to songs or carols concerning Christmas when the "n" is lowercase. Yuletide similarly refers to the season of Christmas as a noun or can be used as an adjective to refer to things relating to Christmas. Nativity refers to both birth and the circumstances surrounding birth, and serves as a reference to Christmas because it refers to the birth of Jesus Christ.