Najadaceae vs liliopsid family

Najadaceae and liliopsid family both are nouns.

Word	Noun	Adjective	Verb	Adverb
Najadaceae	Yes	No	No	No
liliopsid family	Yes	No	No	No

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

Najadaceae: monotypic family of aquatic plants having narrow leaves and small flowers
liliopsid family: family of flowering plants having a single cotyledon (embryonic leaf) in the seed

Other hypernyms of Najadaceae include monocot family.

Najadaceae (noun)	liliopsid family (noun)
monotypic family of aquatic plants having narrow leaves and small flowers	family of flowering plants having a single cotyledon (embryonic leaf) in the seed