This is the 5054th most frequent Portuguese word.
malária
Malária: A disease caused by parasitic protozoans (Plasmodium) transmitted through the bite of infected mosquitoes.
In this sentence, 'malária' is used as a noun to represent the name of the disease.
A malária é uma doença transmitida por mosquitos.
Malaria is a disease transmitted by mosquitoes.
Here, 'malária' is again a noun, showing a specific instance of someone acquiring the disease.
Ele contraiu malária em sua última viagem à África.
He contracted malaria on his last trip to Africa.
In this context, 'malária' functions as a noun within the scope of scientific research and prevention efforts.