Depending on the context of the sentence the word "unknown" can be either an adjective or a noun.
Adjective - The noise came from an unknown direction.
Noun - An unknown was cast in the starring role of the movie.
The word "somebody" is a pronoun. It is used to refer to an unspecified or unknown person.
The word "something" is a pronoun. It is used to refer to an unspecified or unknown thing.
The part of speech for the word "boulevard" is a noun.
It is not ANY part of speech, there is no such English word as "stroobly".
The part of speech for this particular word is a noun.
The word "somebody" is a pronoun. It is used to refer to an unspecified or unknown person.
The word "something" is a pronoun. It is used to refer to an unspecified or unknown thing.
The part of speech that the word my is used as is an adjective.
The part of speech for this particular word is a noun.
Someone is an indefinite pronoun, a word that takes the place of a noun for an unknown or unnamed person. Example: Someone will call you when your order comes in.
The part of speech for the word civilian is English grammar.
The part of speech for the word diplomacy is a noun.
H is a letter, not a word. To be a part of speech, it needs to be a word.
The part of speech for the word "boulevard" is a noun.
The word speech is a noun.
It is not ANY part of speech, there is no such English word as "stroobly".
The part of speech for this particular word is a noun.