"Long" is usually used as an adjective (e.g., a long line), but it can also be an adverb (a long-awaited announcement) or a noun (the signal for the University Bridge is one long and three short).
It is a complex preposition as long as it is used as a phrase.
The word "tirade" is a noun. It refers to a long, angry speech or rant.
It is a verb. Example: He lingered a long time at the cafeteria.
The word "monologue" is a noun. It refers to a long speech or performance by one person.
The phrase "long-time" is an adjective. It means to be extending over a very long time period.
part of speech
The part of speech for this particular word is a noun.
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
The part of speech for "explicit" is an adjective.
The part of speech for "twirl" is a verb.