This is the 12171st most frequent Polish word.
marszałków
"Of marshals" (genitive plural form of "marszałek").
Here, 'marszałków' refers to individuals holding a prestigious state office in a historical context.
Marszałków wybierano do pełnienia wysokich funkcji państwowych.
Marshals were elected to perform high state functions.
This sentence uses 'marszałków' to denote that the palace belongs to or is named after 'marszałkowie', i.e., the marshals.
Pałac marszałków znajduje się na wzgórzu.
The palace of the marshals is located on the hill.
In this case, 'marszałków' refers to individuals participating in an official event, described in a plural form to indicate their presence.