This is the 1364th most frequent Russian word.
ленина
"Ленина" is the genitive or accusative case of "Ленин," typically referring to Lenin, a Russian revolutionary leader, or something named after him.
Here, 'Ленина' is in the genitive case, referring to Lenin's life in a possessive context.
В музее рассказывают о жизни Ленина.
The museum tells about Lenin's life.
In this sentence, 'Ленина' is used in the genitive case as part of a named location, representing Lenin Street.
Мы гуляем по улице Ленина.
We are walking along Lenin street.
Again, 'Ленина' is in the genitive case, showing ownership or association with Lenin's books.