Mephaquine vs antimalarial

Mephaquine and antimalarial both are nouns.

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

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

Mephaquine: an antimalarial drug (trade name Lariam and Mephaquine) that is effective in cases that do not respond to chloroquine; said to produce harmful neuropsychiatric effects on some people
antimalarial: a medicinal drug used to prevent or treat malaria

Other hypernyms of Mephaquine include antimalarial drug.

Mephaquine (noun)	antimalarial (noun)
an antimalarial drug (trade name Lariam and Mephaquine) that is effective in cases that do not respond to chloroquine; said to produce harmful neuropsychiatric effects on some people	a medicinal drug used to prevent or treat malaria