Christmas
Word nature: n.
Some collocation:
at? Christmas
at Christmas
Christmas? card
christmas card
Christmas? carol
Christmas carol
Christmas? Eve
Christmas eve
Christmas? holidays
Christmas holiday; ? Winter vacation (at school, etc)
Christmas? number
Christmas special number
Christmas? present
Christmas present
Christmas? tree
Christmas tree
A? merry? Christmas? (to? you)!
Congratulations on Christmas!