This is the 8685th most frequent Russian word.
папа
Dad.
The word 'папа' is used as a noun to refer to the speaker's father.
Мой папа работает врачом.
My dad works as a doctor.
Here, 'папа' is used in direct address to call the speaker's father.
Папа, ты приготовил ужин?
Dad, did you prepare dinner?
In this case, 'папы' is the genitive case of 'папа', showing possession or origin.