Christmas is also known as Xmas. Learn here if there is a difference between them, according to whychristmas.com.
Some people don’t think it’s correct to call Christmas ‘Xmas’ as that takes the ‘Christ’ (Jesus) out of Christmas. (As Christmas comes from Christ-Mass, the Church service that celebrated the birth of Jesus.)
But that is not quite right! In the Greek language and alphabet, the letter that looks like an X is the Greek letter chi / Χ (pronounced ‘kye’ – it rhymes with ‘eye’) which is the first letter of the Greek word for Christ, Christos.
So Xmas can also mean Christmas; but it should also be pronounced ‘Christmas’ rather than ‘ex-mas’!