It can be used as either an adjective or a noun
Labor Day is a proper noun. It is a specific day.
Write to you soon as a phrase is not one specific part of speech. Write is a verb. To is a preposition. You is a pronoun (object of the preposition.) Soon is an adverb.
Deadline is a noun. It means a specific time by which something must be finished.
The word "haiku" would be a noun. It names a specific form of poetry.
adverb
"Duh" is an interjection, used to express disbelief, sarcasm, or annoyance. It is not a formal part of speech with specific grammatical functions.
The House is a proper noun. It describes a specific house.
Rome is a proper noun. It names a specific city.
Noun - is a person, place, or thing.
It is a proper noun. It refers to a specific road.
Labor Day is a proper noun. It is a specific day.
Labor Day is a proper noun. It is a specific day.
Colorado is a proper noun, as it is the name of a specific place.
District is a noun. It refers to a specific area or region, often with a specific purpose or function.
Write to you soon as a phrase is not one specific part of speech. Write is a verb. To is a preposition. You is a pronoun (object of the preposition.) Soon is an adverb.
"Gee" is typically used as an interjection, expressing surprise, excitement, or emphasis. It is not a specific part of speech in traditional grammar rules.
Oregon is a proper noun, functioning as the name of a specific place. It is not categorized as a traditional part of speech like a noun, verb, adjective, or adverb.