Banana and Plantain

Banana noun - Any of several tropical and subtropical treelike herbs of the genus Musa having a terminal crown of large entire leaves and usually bearing hanging clusters of elongated fruits.

Plantain and banana are semantically related. In some cases you can replace term "Plantain" with "Banana", this nouns are similar.

Plantain noun - A banana tree bearing hanging clusters of edible angular greenish starchy fruits; tropics and subtropics.

Banana and plantain are semantically related. You can use "Banana" instead a noun "Plantain".