This is the 6511th most frequent Russian word.
burisma
"Burisma" is not a Russian word; it is the name of a Ukrainian energy company.
Here, 'Burisma' is used as a proper noun referring to the name of the company.
Компания Burisma занимается добычей природного газа на территории Украины.
The company Burisma is engaged in natural gas extraction in the territory of Ukraine.
In this sentence, 'Burisma' appears as a subject under discussion in the news, maintaining its role as a proper noun.
В новостях часто обсуждают деятельность Burisma и её влияние на экономику.
The news often discuss the activities of Burisma and its impact on the economy.
Again, 'Burisma' is used as a proper noun indicating the specific company in question.