-ist

(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.
pelopathist
Someone who is skilled in the therapeutic uses of mud.
pelotherapist
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.
peltrophilist
A collector of pewterware.
peniatrist
A physician who treats prisoners, as in a penitentiary.
penologist
Someone who studies the theory and practice of prison management.
pentagamist
One who has five spouses.
percussophilist
A collector of old guns.
perfectionist
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.

peridromophilist
A collector of transport tickets.
perinatologist
1. An obstetrician specializing in perinatology.
2. An obstetrical subspecialist concerned with the care of the mother and fetus at higher-than-normal risk for complications.

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.