"Intercity" is an adjective describing something that exists or occurs between cities. It's not a specific place or thing, so it doesn't have a proper noun form.
Here's why:
* Proper nouns: These are names of specific people, places, or things (like "John", "Paris", "Amazon"). They are always capitalized.
* Common nouns: These are general names for people, places, or things (like "man", "city", "river"). They are not capitalized unless they start a sentence.
Examples of how "intercity" is used:
* Intercity bus: A bus that travels between cities.
* Intercity rail: A railway system connecting multiple cities.
* Intercity travel: Journeying between different cities.