Herbaceous plant and Pyramid plant

Herbaceous plant noun - A plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests.

Pyramid plant and herbaceous plant are semantically related. In some cases you can replace phrase "Pyramid plant" with "Herbaceous plant", this phrases are similar.

Pyramid plant noun - Any of various tall perennial herbs constituting the genus Frasera; widely distributed in warm dry upland areas of California, Oregon, and Washington.

Herbaceous plant and pyramid plant are semantically related. You can use "Herbaceous plant" instead a noun phrase "Pyramid plant".