Alexanders and Herbaceous plant

Alexanders noun - European herb somewhat resembling celery widely naturalized in Britain coastal regions and often cultivated as a potherb.

Herbaceous plant and alexanders are semantically related. In some cases you can use "Herbaceous plant" instead a noun "Alexanders".

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

Alexanders and herbaceous plant are semantically related. Sometimes you can replace term "Alexanders" with "Herbaceous plant", this terms are similar.