This is the 3953rd most frequent Russian word.
ереване
"Ереване" is the prepositional case of "Ереван," meaning "in Yerevan," the capital of Armenia.
Here 'Ереване' is the prepositional case of the proper noun 'Ереван', showing location in a state or city.
Я был в Ереване на прошлой неделе.
I was in Yerevan last week.
'Ереване' again in prepositional case, used to describe events or conditions occurring within the city.
Вечера в Ереване особенно красивы весной.
Evenings in Yerevan are especially beautiful in spring.
'Ереване' here indicates a subject of conversation, demonstrating the noun's function within indirect speech or discussion.