foamflower vs herbaceous plant

foamflower and herbaceous plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
foamflower	Yes	No	No	No
herbaceous plant	Yes	No	No	No

As nouns, herbaceous plant is a hypernym of foamflower; that is, herbaceous plant is a word with a broader meaning than foamflower:

foamflower: stoloniferous white-flowered spring-blooming woodland plant
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 foamflower include herb.

foamflower (noun)	herbaceous plant (noun)
stoloniferous white-flowered spring-blooming woodland plant	a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests