This is the 4279th most frequent Polish word.
dziadków
"Dziadków" means "grandparents" in English.
The word 'dziadków' is the plural accusative form of 'dziadkowie' (grandparents) used as the direct object of the verb 'odwiedziłem' (I visited).
Odwiedziłem swoich dziadków w weekend.
I visited my grandparents over the weekend.
The word 'dziadków' here is in the plural genitive case, showing possession in conjunction with 'zdjęcia' (photos).
Zdjęcia dziadków wiszą na ścianie w salonie.
Photos of the grandparents hang on the wall in the living room.
In this sentence, 'dziadków' is in the plural genitive case after the preposition 'u', indicating 'at the place of the grandparents'.