Dual carriageway and Turnpike

Dual carriageway noun - A highway divided down the middle by a barrier that separates traffic going in different directions.

Turnpike and dual carriageway are semantically related. In some cases you can use "Turnpike" instead a noun phrase "Dual carriageway".

Turnpike noun - A passage cleared for public vehicular travel.

Dual carriageway and turnpike are semantically related. (British) Sometimes you can use "Dual carriageway" instead a noun "Turnpike".