Nightshade and Solanum nigrum

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

Solanum nigrum and nightshade are semantically related. In some cases you can replace phrase "Solanum nigrum" with "Nightshade", this terms are similar.

Solanum nigrum 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 Solanum nigrum are semantically related. You can use "Nightshade" instead a noun phrase "Solanum nigrum".