Ground zero and Roots

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

Roots and ground zero are semantically related. In some cases you can use "Roots" instead a noun phrase "Ground zero".

Roots noun - The condition of belonging to a particular place or group by virtue of social or ethnic or cultural lineage.

Ground zero and roots are semantically related. Sometimes you can use "Ground zero" instead a noun "Roots".