Duty and Ground zero

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

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

Ground zero noun - A thing or place that is of greatest importance to an activity or interest.

Duty and ground zero are semantically related in aim topic. You can use "Duty" instead a noun phrase "Ground zero".