Lemnaceae vs monocot family

Lemnaceae and monocot family both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lemnaceae	Yes	No	No	No
monocot family	Yes	No	No	No

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

Lemnaceae: family of small free-floating thalloid plants
monocot family: family of flowering plants having a single cotyledon (embryonic leaf) in the seed

Other hypernyms of Lemnaceae include liliopsid family.

Lemnaceae (noun)	monocot family (noun)
family of small free-floating thalloid plants	family of flowering plants having a single cotyledon (embryonic leaf) in the seed