This is the 15863rd most frequent Polish word.
tarką
"Grater."
Here, 'tarki' is used as the instrumental case of 'tarka'.
Używam tarki do starcia sera.
I use a grater to grate cheese.
In this sentence, 'tarkę' is the accusative case of 'tarka', used to show the direct object of the sentence.
Mam w kuchni nową tarkę.
I have a new grater in the kitchen.
Here, 'tarce' is the locative case of 'tarka', used after the preposition 'na' to indicate location.