Yes, "DC" is a proper noun when it refers to Washington, D.C., the capital of the United States, or to the comic book publisher DC Comics. Proper nouns are specific names of people, places, or organizations, and in this case, "DC" identifies a unique entity. When used in other contexts, it may not function as a proper noun.
"Route" is not a proper noun and does not have to be capitalized by itself. A proper noun is a noun that names a SPECIFIC person, place or thing. For example, city is a regular noun, but Washington DC is a proper noun because it is a name of a specific city.
Washington DC is the name of a place, which means it is a proper noun.Proper nouns are the names of specific people (George Washington, Marie Antoinette), the names of specific places (Washington DC, Japan), or specific things (Oreo, Toyota Prius).
Examples of common nouns for the proper noun 'Washington, DC' are:cityplacecapitalmetropolislocation
The word creek is a common noun unless used for a specific creek such as Rock Creek in Washington, DC or a proper name such as Coldwater Creek fashions.
As a name of a road , Park Avenue', it is a proper noun, and both words star with a capital letter. However, when used separately, as 'the park, or 'the avenue', they are common nouns and so not need a capital letter.
The proper noun is spelled Washington (e.g. George Washington, Washington state, Washington, DC).
Pencil proper or common noun
The noun 'poet' is a common noun, a general term for anyone who writes poetry of any kind.A proper noun is the name of a specific person, place, thing, or a title; for example:Natasha Trethewey, United States Poet Laureate as of 2012Carol Ann Duffy, Poet Laureate of the United Kingdom as of 2009Poets' Walk Park, Red Hook, NYBusboys and Poets (cafe), Washington, DC
Exxon is a proper noun
proper noun
A noun is a word for a person, a place, or a thing.A proper noun is the name of a specific person, place, or thing.A common noun is a general word for a person, a place, or a thing.EXAMPLESPerson:neighbor - common nounsister - common nounpilot - common nounNed Flanders - proper nounMother Teresa - proper nounWright Brothers - proper nounPlace:country - common nouncapital - common nounpark - common nounPortugal - proper nounWashington DC - proper nounYellowstone National Park - proper nounThing:street - common nounelephant - common nouncookie - common nounChamps Elysées - proper nounDumbo - proper nounOreo - proper noun
The common noun for the proper noun Arlington is city.The common noun for the proper noun Virginia is state.