Hardwood.
Hardwoods, such as oak, teak, mahogany, etc.
Oak is the tree. An acorn which is the seed of the Oak will produce more trees. The Oak when cut down will produce timber which is Oak timber.
Oak is a natural timber, derived from oak trees. It is a hardwood commonly used in construction, furniture making, and flooring due to its strength and durability.
Oak is well-regarded as strong, but is expensive. Consider getting a more affordable timber if oak is too pricey.
There are a number of popular oak timber merchants in the UK. They include Davies Timber and the Whitnet Sawmill. Both of these have websites which give information on the products they can supply.
Wood, timber, tree .... plank
Yes oak tree is a timber producing plant and furniture can be made out of its wood.
Matching timber.
Hardwood Timber, Softwood Timber and Plywood
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Oak wood as timber is prized for its strength, elasticity, and durability in making furniture, ships etc. Oak acorns are a source of food for wildlife and farm animals. And more . . .