A redwood is an extremely tall tree which grows in California.
Redwood is the wood from this tree.
redwood in British English
(ˈrɛdˌwʊd)
noun
a giant coniferous tree, Sequoia sempervirens, of coastal regions of California, having reddish fibrous bark and durable timber: family Taxodiaceae. The largest specimen is over 120 metres (360 feet) tall
See also sequoia
redwood in American English
(ˈrɛdˌwʊd)
noun
1. US
a giant evergreen (Sequoia sempervirens) of the baldcypress family, having fire-resistant bark, enduring, soft wood, and needlelike leaves: found in coastal regions of California and S Oregon
2. US
big tree
3.
any of a number of trees with reddish wood or yielding a red dye