Lumbar & Lumber

Lumbar means relating to the area between the thoracic vertebrae and the region of the sacrum or pelvis: “He is not ready to get his lumber region of the back operated though he suffers from acute pain.”
Lumber has the following meanings:-
1. To move heavily often as a result of carrying great weight: The old man lumbered as he carried a very heavy suitcase.”
2. Logs or lengths of wood that are cut specifically to be used for construction; the store or location which sells the prepared logs, etc.: ” The rail track is not being repaired because logs are not available in the lumber yard.”