Herbaceous plant and Viper's bugloss

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

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

Viper's bugloss noun - A coarse prickly European weed with spikes of blue flowers; naturalized in United States.

Herbaceous plant and viper's bugloss are semantically related. You can use "Herbaceous plant" instead a noun phrase "Viper's bugloss".