Probate:
The process of proving in court that the will of a person who has died is valid.
http://www.merriam-webster.com/dictionary/probate
Will:
Law: a legal document in which a person states who should receive his or her possessions after he or she dies.
http://www.merriam-webster.com/dictionary/will
Executor:
Someone who is named in a will as the person who will make sure that the instructions in the will are properly followed.
http://www.merriam-webster.com/dictionary/%20executor
Decedent:
A deceased person —used chiefly in law.
http://www.merriam-webster.com/dictionary/decedent?show=0&t=1391540705
Estate
1. All of the things that a person owns.
2. The things left by someone who has died.
http://www.merriam-webster.com/dictionary/estate?show=0&t=1391539704
Personal Representative:
A person who manages the affairs of another.
http://dictionary.reference.com/browse/personal+representative+?s=t
Testator:
1. A person who makes a will.
http://dictionary.reference.com/browse/TESTATOR?s=t
