Atabrine vs antimalarial

Atabrine and antimalarial both are nouns.

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

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

Atabrine: 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 Atabrine include antimalarial drug, anthelminthic, anthelmintic, helminthic, vermifuge.

Atabrine (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