(Greek > Latin: a suffix; one who believes in; one who is engaged in; someone who does something)

pejorist (PEJ or rist)
Someone who believes that the conditions in the world are becoming worse; such as, with climatic changes; what is happening with economics and government policies; religious hypocrisy or pretense of virtue; internet fraud; military wars; terrorism in the name of religion; greed, public and private individuals; false accusations in politics; ego-centric, foul-mouthed, rabble-rousing (stirring up the passions or prejudices of the public) talk-show hosts (on radio, television, and at rallies) and their followers; company executives, politicians, and others who lie and commit fraudulent acts; etc., etc.
Someone who is skilled in the therapeutic uses of mud.
A therapist who applies mud for therapeutic purposes, commonly in the form of hot mud packs in conjunction with mineral spa therapy, or by beauticians for purported effects on the skin.
A collector of pewterware.
A physician who treats prisoners, as in a penitentiary.
Someone who studies the theory and practice of prison management.
One who has five spouses.
A collector of old guns.
perfusionist (s) (noun), perfusionists (pl)
An individual who assists the physician in all aspects of managing the equipment and techniques used during extra-corporeal circulation.

A perfusionist may also be involved in inducing prescribed hypothermia.

A collector of transport tickets.
perinatologist (s) (noun), perinatologists (pl)
An obstetrical expert or subspecialist concerned with the care of the mother and fetus at higher-than-normal risk for complications: Because Rose was older than normal for expecting her first baby, she was cared for by a perinatologist in the hospital, who made sure that she received any medical treatment necessary before giving birth to her newborn.

A perinatologist logically could be an obstetrician or pediatrician, but in practice, a perinatologist is an obstetrician.

The comparable area of pediatrics is neonatology. A high-risk baby might be cared for by a perinatologist before birth and by a neonatologist after birth.

periodontist (s), periodontists (pl)
A specialist in the placement and maintenance of dental implants.
pessimist (s) (noun), pessimists (pl)
1. Someone who always expects the worst to happen: A pessimist never expects anything to turn out well.
2. A person who habitually sees or anticipates the bad situations or is disposed to be gloomy: Pessimists see the world as excessively cruel in many ways.
3. Etymology: from Latin pessimus, "worst".
One who sees the worst side of things.
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petrologist (s) (noun), petrologists (pl)
A person who is a specialist in the field of large and small boulders: A famous petrologist was invited to be a guest speaker at Calvin's university and to give a talk about the composition and texture of igneous matter; such as, slate, marble, granite, and schist or fine-grained sandstone, etc.