This is the 6455th most frequent Polish word.
chocianowicka
"Chocianowicka" is a proper noun, typically referring to a street name in Poland, specifically in the city of Łódź.
In this sentence, 'chocianowicka' is used as an adjective describing the street ('ulica'), indicating its specific name.
Chocianowicka ulica jest zawsze pełna samochodów.
The Chocianowicka street is always full of cars.
Here, 'Chocianowickiej' is in the locative case, referring to being on the street named Chocianowicka.
Zgubiłem się na Chocianowickiej i nie mogłem znaleźć drogi powrotnej.
I got lost on Chocianowicka and couldn't find my way back.
In this sentence, 'Chocianowickiej' is in a grammatical case indicating the location of the stop.