This is the 120th most frequent Marathi word.
कश
The Marathi word "कश" means "of what" or "what for" in English.
The word 'कशासाठी' means 'for what purpose' and is used to inquire about the reason or purpose in this question.
कशासाठी तो दुकानात गेला?
Why did he go to the store?
The word 'कशा' refers to 'which' here, denoting a choice among routes.
तू कशा मार्गाने तिथे पोहोचला?
Which route did you take to get there?
The word 'कशामुळे' means 'due to what', asking the cause of an event.