Duty and Sales tax

Duty noun - A charge usually of money collected by the government from people or businesses for public use.

Sales tax and duty are semantically related. In some cases you can use "Sales tax" instead a noun "Duty".

Sales tax noun - A tax based on the cost of the item purchased and collected directly from the buyer.

Duty and sales tax are semantically related. Sometimes you can use "Duty" instead a noun phrase "Sales tax".