This is the 9316th most frequent Russian word.
стукова
The word "стукова" does not exist as a standard word in Russian. It might be a typo or a misunderstanding.
In this context, 'стукова' (genitive case of 'стук') refers to the sound of knocking.
Из-за стукова в двери я решил проверить, кто там.
Because of the knocking on the door, I decided to check who was there.
The term 'стук' refers to the act or sound of knocking, here used in singular nominative case.
Стук в окно заставил меня обратить внимание.
The knocking on the window caught my attention.
'Стукова' is used to describe the knocking act or sound in the genitive case, characterizing the source of the sound.