different between heartwood vs purpleheart

English

heart +? wood

heartwood (countable and uncountable, plural heartwoods)

The wood nearer the heart of a stem or branch, different in color from the sapwood
A popular myth is that heartwood is stronger than sapwood.
The staves are split from the heartwood. The heartwood is composed of dead cells; it supports the tree, but no longer has any physiological purpose. The staves must follow the grain of the wood to achieve a watertight cask, so they are split rather than sawn. — L'encyclopédie du Cognac: From log to stave

purple +? heart

purpleheart (plural purplehearts)

A large tropical tree, of the genus Peltogyne, native to parts of South America and the West Indies
The purplish heartwood of this tree, used to make furniture