Another word for the highway is the interstate, freeway or turnpike.
Tornado
street, highway, road, avenue.
The word originates from Old English heiweg "main road from one town to another."
Road Avenue Lane Highway
The word highway is a thing.
Synonymous with? No. That would mean highway laws and constitutional law were the same, and interchangeable with one another. Maybe the word you're looking for is "analogous"?
The word highway can be written out fully as Highway or it can also be abbreviated. The abbreviation for highway is hwy.
I drove on a highway to get to my destination.
The plural form for the singular highway is highways.
The noun highway is a singular, common, concrete, compound noun, a word for a thing.
Interstate
It's time to hit the highway. The highway is jammed, right now. Let's take the expressway, instead of the highway.