golden spleen vs aquatic plant

golden spleen and aquatic plant both are nouns.

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

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

golden spleen: any of various low aquatic herbs of the genus Chrysosplenium
aquatic 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 hydrophyte, hydrophytic plant, water plant.

golden spleen (noun)	aquatic 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