This is the 10628th most frequent Polish word.
domostw
"Domostw" is the genitive plural form of "domostwo," meaning "households" or "homes."
The word 'domostw' here is the plural form of 'domostwo', used in the genitive case to describe possessions or collections of homes/homesteads in a landscape.
Przez wieś prowadzi droga wśród wielu pięknych domostw.
The road through the village passes among many beautiful homesteads.
In 'domostwami', the word is in the instrumental plural case, referring to the individual homes or residences owned and maintained by people.
Opiekowali się swoimi domostwami, dbając o ich porządek.
They took care of their homesteads, maintaining their order.
Here, 'domostwa' is in the accusative plural case, referring to the structures referred to as 'homesteads' being acted upon (built) by ancient people.