This is the 929th most frequent Russian word.
парка
"Парка" in English means "parka," a type of warm, hooded coat.
Here, 'парка' is an inflected form of 'парк' (park) indicating the instrumental case after the preposition 'в' with the meaning of location.
Я гулял в парке вечером.
I walked in the park in the evening.
In this case, 'парк' (park) is in the nominative case as the subject of the clause.
Вход в парк был закрыт.
The entrance to the park was closed.
Here, 'парка' (parka) refers to an article of clothing and is unrelated to parks; it is in nominative case, singular, and feminine gender, describing the item.