Hemlock and Winter fern

Hemlock 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.

Winter fern is a synonym for hemlock. In some cases you can use "Winter fern" instead a noun "Hemlock".

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.

Hemlock is a synonym for winter fern. You can use "Hemlock" instead a noun phrase "Winter fern".