guanabenz vs antihypertensive

guanabenz and antihypertensive both are nouns.

Word	Noun	Adjective	Verb	Adverb
guanabenz	Yes	No	No	No
antihypertensive	Yes	No	No	No

As nouns, antihypertensive is a hypernym of guanabenz; that is, antihypertensive is a word with a broader meaning than guanabenz:

guanabenz: antihypertensive drug (trade name Wytensin) that reduces blood pressure by its effect on the central nervous system
antihypertensive: a drug that reduces high blood pressure

Other hypernyms of guanabenz include antihypertensive drug.

guanabenz (noun)	antihypertensive (noun)
antihypertensive drug (trade name Wytensin) that reduces blood pressure by its effect on the central nervous system	a drug that reduces high blood pressure