It can be used as either an adjective or a noun
adverbial conjunction, adverb
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.
The word "haiku" would be a noun. It names a specific form of poetry.
Deadline is a noun. It means a specific time by which something must be finished.
what part of speech is work
It is a proper noun. It refers to a specific road.
The House is a proper noun. It describes a specific house.
Labor Day is a proper noun. It is a specific day.
Rome is a proper noun. It names a specific city.
Noun - is a person, place, or thing.
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.
Saxon in a noun. It refers to a specific location or type of person.
Labor Day is a proper noun. It is a specific day.
The word Detroit is a proper noun, the name of a specific place.
The word "property" can be a noun or an adjective.
Nurse Ann is a proper noun. It refers to a specific person.