Interstate
Part of speech: adjective
Definition: of, or relating to two or more states
Part of speech: noun
Definition: A freeway that is part of the Interstate Highway System.
Example sentence: The gas tax has been the backbone of the transportation system since the inception of the Interstate highway system in the 1950s.
Freeway
Part of speech: noun
Definition: A road designed for safe high-speed operation of motor vehicles through the elimination of at-grade intersections, usually divided and having at least two lanes in each direction; a dual carriageway with no at-grade crossings.A toll-free highway.