Terminology
In the United Kingdom and other Commonwealth Countries such as Australia and New Zealand, timber is a term used for sawn wood products, such as floor boards, whereas generally in the United States and Canada, it refers to felled trees, later milled into boards referred to as lumber. "Timber" is also used there to describe sawn lumber not less than 5 inches (127 mm) in its smallest dimension. An example of the latter is often partially finished lumber used in timber-frame construction.
In the United Kingdom the word lumber has several other meanings, including unused or unwanted items.
Read more about this topic: Lumber