This is the 3412th most frequent Swedish word.
belarusier
A "Belarusian" (a person from Belarus).
Here, 'belarusier' is used as a singular noun describing an individual from Belarus.
En belarusier berättade om livet i Minsk under en föreläsning.
A Belarusian spoke about life in Minsk during a lecture.
In this context, 'belarusier' is used as a plural noun indicating several people from Belarus participating in an event.
Jag träffade några belarusier som besökte Sverige för att delta i en kulturfestival.
I met some Belarusians visiting Sweden to participate in a cultural festival.
In this sentence, 'Belarusierna' is used as a plural noun referring to the people of Belarus collectively.