If you mean the part of speech, it is a noun.
If you mean the etymology, it comes from Greek.
it's a preposition
Adjective
Sudden is an adjective.
It falls into the action category
The word "you" belongs to the pronoun word class, particularly as a second person singular pronoun. It is used to refer to the person or people being spoken to.
Normally, a family history of great wealth, nobility.
Ornithologist.
Tigers belong to Class Mammalia.
Opossums belong to the class mammalia.
The word "saw" can be both a verb (past tense of see) and a noun (a tool used for cutting).
preposition
They belong to the class Mammalia ( mammals).