Christmas
Part of speech: noun
Definition: The Christian holiday which celebrates the birth of Jesus Christ. Christmas Day, the day it is celebrated, 25th December, an English quarter day. Christmastide, the Twelve Days of Christmas, the season (traditionally from the 24th of December to the 6th of January) around the celebration of Christ's birth. The period from the Friday following Thanksgiving to Christmas Eve, busy with shopping and preparations for Christmas. Christmas season, the end of the year period, busy with shopping and preparations for Christmas.
Christmastide
Part of speech: proper noun
Definition: the Christmas seasonthe Twelve Days of Christmas