Theory:

Besides food, medicine, and fibre, plants are used to yield timber. Timber is the wood obtained to build houses, furniturehandicrafts, toys, musical instruments, carving etc.
 
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Timber
 
The wood required for these purposes is obtained from certain plants. Features of wood that are used as timber:
  1. Durability
  2. Strength
  3. Stylish finishing
  4. Hardness
  5. Resistance to the changes in temperature
  6. Low moisture content
  7. Texture according to the usage  
Timbers are classified into two according to their structure:
  • Hardwoods
  • Softwoods
Hardwoods
Hardwoods are obtained mostly from dicots and angiosperms (the largest group of land plants) that are flowering plants. Hardwoods are hard and heavy with a rough texture. Decks, high-quality furniture, wooden constructions, hardwood flooring, and boat-building are hardwood uses.
Example:
Wood obtained from teak, jackfruit, oak, mahogany, walnut, beech, hickory, maple, cherry etc.
 
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Teak wood
Softwoods:
Softwoods are obtained from gymnosperms which are non-flowering trees. Few angiosperms also produce softwood. Softwood is soft and light that has a fine texture. They have a comparatively lower density than hardwoods. Softwoods are easier to carve and use and thus have higher workability than hardwoods.
 
Softwoods have a wide range of applications which include making plywood, wooden boxes, medium-density-fibreboard (MDF), home cabins and furniture, ladders, and also for the production of paper pulp (making paper).
Example:
Wood obtained from pine, katampu, cedar, Douglas fir, juniper, redwood, spruce etc.
 
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Pine wood
Composite wood:
Composite wood is manufactured from a variety of materials. A variety of materials are combined to make them stronger and durable.
 
Plywood is a composite wood created by finely-cut wooden boards from wood. These are layered one above the other as thin laminating sheets of wood. These together make a thicker and a stronger final product.
 
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Plywood
Reference:
https://upload.wikimedia.org/wikipedia/commons/d/da/Timber_stacks_on_Beechen_Lane%2C_New_Forest_-_geograph.org.uk_-_210787.jpg