This is the 1946th most frequent Polish word.
bohaterów
"Heroes" (genitive or accusative plural form).
The word 'bohaterów' is used in its plural accusative form, indicating it refers to the direct object, 'heroes,' to whom the memory is dedicated.
W muzeum znajduje się wystawa poświęcona pamięci bohaterów narodowych.
In the museum, there is an exhibition dedicated to the memory of national heroes.
Here 'bohaterów' is in its plural genitive form, used in this context to describe the possession related to the adventures.
Przeczytałam książkę o przygodach bohaterów z tej powieści.
I read a book about the adventures of the heroes from this novel.
In this sentence, 'bohaterów' is again used in its plural genitive form, fitting the structure to describe 'fates' related to these heroes.