hornwort vs liverwort

hornwort and liverwort both are nouns.

Word	Noun	Adjective	Verb	Adverb
hornwort	Yes	No	No	No
liverwort	Yes	No	No	No

As nouns, liverwort is a hypernym of hornwort; that is, liverwort is a word with a broader meaning than hornwort:

hornwort: liverworts with slender hornlike capsules
liverwort: any of numerous small green nonvascular plants of the class Hepaticopsida growing in wet places and resembling green seaweeds or leafy mosses

Other hypernyms of hornwort include hepatic.

hornwort (noun)	liverwort (noun)
liverworts with slender hornlike capsules	any of numerous small green nonvascular plants of the class Hepaticopsida growing in wet places and resembling green seaweeds or leafy mosses
any aquatic plant of the genus Ceratophyllum; forms submerged masses in ponds and slow-flowing streams