lion's-ear vs herbaceous plant

lion's-ear and herbaceous plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
lion's-ear	Yes	No	No	No
herbaceous plant	Yes	No	No	No

As nouns, herbaceous plant is a hypernym of lion's-ear; that is, herbaceous plant is a word with a broader meaning than lion's-ear:

lion's-ear: pantropical herb having whorls of striking lipped flowers; naturalized in United States
herbaceous plant: a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests

Other hypernyms of lion's-ear include herb.

lion's-ear (noun)	herbaceous plant (noun)
pantropical herb having whorls of striking lipped flowers; naturalized in United States	a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests