Buckeye and Chestnut tree

Buckeye noun - Tree having palmate leaves and large clusters of white to red flowers followed by brown shiny inedible seeds.

Chestnut tree and buckeye are semantically related. In some cases you can use "Chestnut tree" instead a noun "Buckeye".

Chestnut tree noun - Any of several attractive deciduous trees yellow-brown in autumn; yield a hard wood and edible nuts in a prickly bur.

Buckeye and chestnut tree are semantically related. You can use "Buckeye" instead a noun phrase "Chestnut tree".