The term 'Main Route' can be defined by four different words: PIKE (4 letters), ARTERY (6 letters), HIGHWAY (7 letters), and AUTOBAHN (8 letters). A PIKE is a narrow road, usually with two lanes, that connects two larger roads. An ARTERY is a major road or HIGHWAY that carries a large amount of traffic. A HIGHWAY is a main road that connects two cities or towns, often with multiple lanes. An AUTOBAHN is a German HIGHWAY system that has no speed limit. All of these terms refer to a main route, which is a major road or HIGHWAY that carries a large amount of traffic.