In most simple terms, if it were someone outside of the clergy offering a memorialisation of the deceased, that person might be referred to as an Eulogist.
The burial buildings are called pyramids. There are several rooms in a pyramid.
The process of taking a corpse and preparing it for burial is called mummification.
When a priest speaks in Church as part of a Liturgy or Service, it is called a Sermon.
A person who speaks two languages is called a bilingual.
Catacombs???
Tombs
damdarikidathom
it is called a crypt
A catacomb
not sure
Eulogy
The person who speaks for another is called a spokesperson or a representative. They convey the thoughts, beliefs, or actions of the person or group they are representing.