"permission" and "admission" are two different words with distinct meanings.
"permission" refers to the act of allowing someone to do something. When you give permission, you are granting someone the right or authority to do something. For example, if you give someone permission to enter your house, you are allowing them to come inside.
"admission" refers to the act of allowing someone to enter a place, such as a building, event, or organization. Admission often involves some form of payment, ticket, or acceptance into a program or institution. For example, if you have been admitted to a university, you have been accepted as a student.
In summary, permission is about granting the right or authority to do something, while admission is about allowing someone to enter a place or be accepted into a program or institution.