Chestnut tree and Horse chestnut

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

Horse chestnut and chestnut tree are semantically related. In some cases you can use "Horse chestnut" instead a noun phrase "Chestnut tree".

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

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