Muggles' Guide to Harry Potter/Magic/Mobiliarbus

Overview
Mobiliarbus, a rather specialized charm, is used to move a tree.

Extended Description
Hermione uses this spell to move a Christmas tree in The Three Broomsticks, to better hide Harry from a number of teachers who have just walked in.

Analysis
The Latin root "mobili" means "mobile," while "arbus" means "tree." This implies this spell is used only to move trees.