This is the 745th most frequent French word.
noël
Christmas.
Here, 'Noël' is used as a proper noun referring to the holiday of Christmas.
Noël approche à grands pas, il est temps de décorer le sapin.
Christmas is fast approaching, it's time to decorate the tree.
'Noël' functions as an adjective qualifying 'chanson,' describing it as related to Christmas.
La chanson de Noël qu'on entend partout est très joyeuse.
The Christmas song that is heard everywhere is very cheerful.
'Noël' is a time reference here, indicating the occasion for which the card was given.