waterleaf vs herbaceous plant

waterleaf and herbaceous plant both are nouns.

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

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

waterleaf: any of several plants of the genus Hydrophyllum
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 waterleaf include herb.

waterleaf (noun)	herbaceous plant (noun)
any of several plants of the genus Hydrophyllum	a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests