Yuletide: Christmas season
Yule: Christmas
Xmas: a shortening of the word Christmas, derived from the Greek letter chi (X), the first letter in the Greek word for Christ;
wassail: (a) to sing carols from house to house at Christmas;
simnel: a bun or bread of fine wheat flour;
shammes: the candle or taper used to light the other candles in a Hanukkah menorah;
noel: a Christmas carol
glogg: a hot spiced wine and liquor punch served in Scandinavian countries as a Christmas drink.
dreidel: a children's game of chance played especially at Hanukkah with a four-sided toy marked with Hebrew letters and spun like a top
Christmas pudding: plum pudding
Christmas club:  a savings account in which regular deposits are made year-round to provide money for Christmas shopping;
Boxing Day: the first weekday after Christmas, observed as a legal holiday in parts of the Commonwealth of Nations and marked by the giving of Christmas boxes to service workers (e.g., postal workers);
                 Christmas Day is the one day of the year when London practically shuts down. Major sights and shops close their doors, the Tube and buses come to a standstill, and most people are at home unwrapping presents. But it's also the ideal time to take advantage of the crowd-free streets and go for a stroll.