This is the 4326th most frequent Russian word.
белорусов
"Белорусов" means "Belarusians" (plural form), referring to people from Belarus.
Here, 'белорусов' functions as the direct object in the sentence, referring to people of Belarus.
Белорусов пригласили участвовать в международном фестивале.
Belarusians were invited to participate in the international festival.
In this sentence, 'белорусов' is in the genitive case, used for indicating possession or the object of discussion.
Мы говорили о культуре и традициях белорусов.
We talked about the culture and traditions of Belarusians.
Here, 'белорусов' is in the genitive plural case, expressing quantity in relation to a number.