This is the 3283rd most frequent Russian word.
остановки
"Stops" (e.g., bus stops or pauses).
Here, 'остановке' refers to a physical bus stop.
Автобус останавливается на каждой остановке.
The bus stops at each stop.
In this sentence, 'остановок' refers to breaks or pauses during an activity.
Перед нашей прогулкой мы сделали несколько остановок, чтобы отдохнуть.
Before our walk, we made several stops to rest.
Here, 'остановке' again implies a specific location designated as a bus stop.