Poisonous plant and Winter fern

Poisonous plant noun - A plant that when touched or ingested in sufficient quantity can be harmful or fatal to an organism.

Winter fern and poisonous plant are semantically related. In some cases you can replace phrase "Winter fern" with "Poisonous plant", this phrases are similar.

Winter fern noun - Large branching biennial herb native to Eurasia and Africa and adventive in North America having large fernlike leaves and white flowers; usually found in damp habitats; all parts extremely poisonous.

Poisonous plant and winter fern are semantically related. You can use "Poisonous plant" instead a noun phrase "Winter fern".