This is the 4168th most frequent Portuguese word.
sonangol
Sonangol: Angola's national oil company (Sociedade Nacional de Combustíveis de Angola).
Here, 'Sonangol' is used as a proper noun referring to a company's name.
A Sonangol é a principal empresa de petróleo da Angola.
Sonangol is the main oil company of Angola.
In this sentence, 'Sonangol' again acts as the name of the specific entity where the speaker worked.
Trabalhei na Sonangol durante cinco anos.
I worked at Sonangol for five years.
Here, 'Sonangol' is attributively used in relation to its actions, emphasizing its corporate activities.