State highway and Turnpike

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

Turnpike and state highway are semantically related in road requiring payment for use topic. In some cases you can use "Turnpike" instead a noun phrase "State highway".

Turnpike noun - An expressway on which tolls are collected.

State highway and turnpike are semantically related in highway topic. You can use "State highway" instead a noun "Turnpike".