What is the difference between sinew and tendon?

They get used somewhat interchangeably, which blurs the lines on the definitions.

When I had my anatomy classes, sinews were regarded as an inclusive class, which included both ligaments and tendons.

For the breakdown:

• Tendon: Fibrous tissue that connects muscle to bone.
• Ligament: Fibrous tissue that connects bone to bone.
• Sinew: Includes both of the above.