methyldopa vs antihypertensive

methyldopa and antihypertensive both are nouns.

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

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

methyldopa: antihypertensive drug (trade name Aldomet) used in the treatment of high blood pressure
antihypertensive: a drug that reduces high blood pressure

Other hypernyms of methyldopa include antihypertensive drug.

methyldopa (noun)	antihypertensive (noun)
antihypertensive drug (trade name Aldomet) used in the treatment of high blood pressure	a drug that reduces high blood pressure