If you are looking for Christmas tree decorations then nearly every supermarket and department store will stock them in the lead up to Christmas. You can also get them online at Amazon and Ebay.
maybe 'ornament' would fit the crossword
Mistletoe
Undecorated christmas tree
for decoration in the house
Tinsel as a Christmas tree decoration originated in Nuremberg, Germany around 1610. Before that, it was used primarily as a decoration for sculptures.
The common decoration for the top of a Christmas tree, is a star.
A tree of course!
One of the modern Christmas decorations you could use are non-traditional Christmas trees. You can find many on this site, with links to the stores where you can find them:(http://www.digsdigs.com/10-modern-christmas-tree-alternatives/).
I would describe someone as a walking Christmas tree if that person was wearing a ridiculously excessive amount of decoration.
The primary Christmas decoration in France is the Christmas tree (or, in French, sapin de noel).
A yule tree is an evergreen tree used as a decoration at Christmas time, also known as a Christmas tree.
A star or an angel is the most common decoration to put on the top of a Christmas tree.