Nightshade and Poisonberry

Nightshade noun - Any of numerous shrubs or herbs or vines of the genus Solanum; most are poisonous though many bear edible fruit.

Poisonberry and nightshade are semantically related. In some cases you can replace term "Poisonberry" with "Nightshade", this nouns are similar.

Poisonberry noun - Eurasian herb naturalized in America having white flowers and poisonous hairy foliage and bearing black berries that are sometimes poisonous but sometimes edible.

Nightshade and poisonberry are semantically related. You can use "Nightshade" instead a noun "Poisonberry".