pondweed vs liliopsid genus

pondweed and liliopsid genus both are nouns.

Word	Noun	Adjective	Verb	Adverb
pondweed	Yes	No	No	No
liliopsid genus	Yes	No	No	No

As nouns, liliopsid genus is a hypernym of pondweed; that is, liliopsid genus is a word with a broader meaning than pondweed:

pondweed: submerged freshwater perennials
liliopsid genus: genus of flowering plants having a single cotyledon (embryonic leaf) in the seed

Other hypernyms of pondweed include monocot genus.

pondweed (noun)	liliopsid genus (noun)
any of several submerged or floating freshwater perennial aquatic weeds belonging to the family Potamogetonaceae	genus of flowering plants having a single cotyledon (embryonic leaf) in the seed
submerged freshwater perennials