golden spleen vs water plant

golden spleen and water plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
golden spleen	Yes	No	No	No
water plant	Yes	No	No	No

As nouns, water plant is a hypernym of golden spleen; that is, water plant is a word with a broader meaning than golden spleen:

golden spleen: any of various low aquatic herbs of the genus Chrysosplenium
water plant: a plant that grows partly or wholly in water whether rooted in the mud, as a lotus, or floating without anchorage, as the water hyacinth

Other hypernyms of golden spleen include aquatic plant, hydrophyte, hydrophytic plant.

golden spleen (noun)	water plant (noun)
any of various low aquatic herbs of the genus Chrysosplenium	a plant that grows partly or wholly in water whether rooted in the mud, as a lotus, or floating without anchorage, as the water hyacinth