A surrogate mother.
A person who carries luggage for someone else is often called a porter, from the Latin/Frendh/Italian words meaning "to carry".
An armourbearer is a person who carries armour for another person.
This is known as mirror-touch synesthesia, a condition where individuals can physically feel sensations and emotions that they see others experiencing. It can involve experiencing tactile sensations upon seeing someone being touched or feeling the emotions of others through physical contact.
Someone who is apprenticed is a person who works for another person so that they can learn a trade.
Such a person can be called a gold digger.
An organism that carries a disease-causing microorganism from one host to another is called a vector. An example of a vector is a deer tick carrying Lyme disease.
A bag-carrier is a person who carries another person's bags.
Hod carrier
Caddy.
Magistrate
a caddie
Posture.