It is a prime number
prime is an adjective
Who is the prime minister of Canada?what is a prime number?I am prime in that position.this is the prime mover.how is that prime?
Class trip is not a compound word.
Prime and odd are the only ones I could think of
it's a preposition
Adjective
"Prime" can function as an adjective or a verb. As an adjective, it describes something of the best quality or in its best condition. As a verb, it means to prepare something for use or action.
Sudden is an adjective.
It falls into the action category
If you mean the part of speech, it is a noun. If you mean the etymology, it comes from Greek.
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.
Ornithologist.
Tigers belong to Class Mammalia.
Opossums belong to the class mammalia.
A piranha belong to the Phylum Chordata, and the class Osteichthyes.
Sea fans belong to the class Anthozoa