Throughway and Turnpike

Throughway noun - A broad highway designed for high-speed traffic.

Turnpike and throughway are semantically related. in road topic. In some cases you can use "Turnpike" instead a noun "Throughway", when it comes to topics like path upon which travel occurs.

Turnpike noun - An expressway on which tolls are collected.

Throughway and turnpike are semantically related. (American) You can use "Throughway" instead a noun "Turnpike".