mepacrine vs antimalarial

mepacrine and antimalarial both are nouns.

Word	Noun	Adjective	Verb	Adverb
mepacrine	Yes	No	No	No
antimalarial	Yes	No	No	No

As nouns, antimalarial is a hypernym of mepacrine; that is, antimalarial is a word with a broader meaning than mepacrine:

mepacrine: a drug (trade name Atabrine) used to treat certain worm infestations and once used to treat malaria
antimalarial: a medicinal drug used to prevent or treat malaria

Other hypernyms of mepacrine include antimalarial drug, anthelminthic, anthelmintic, helminthic, vermifuge.

mepacrine (noun)	antimalarial (noun)
a drug (trade name Atabrine) used to treat certain worm infestations and once used to treat malaria	a medicinal drug used to prevent or treat malaria