Sir,
What I have understood from the definition of a key is that it’s a set of attributes that can uniquely identify each tuple in a relation uniquely.
Suppose in relation R{A, B, C, D}, one candidate key is {A, B}, so it is a super key also but {A, B, C} this is a super key but not a candidate key.
Every candidate key is super key but the converse is false.
So, If a relation has 5 keys then I can guarantee that all of them are super keys but can not guarantee that all of them are candidate keys.