-ist

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

literalist (s) (noun), literalists (pl)
1. Someone who strives to present the exact representation of a statement or law: Jack had to be a literalist when executing the statutes with accuracy and correctness.
2. A person who translates a text as clearly as possible: In the special language class at school, Grace learned how to be a literalist in that she worked on interpreting written work with preciseness and exactness.
lithotomist
A surgeon or other physician who removes stones, particularly from the bladder.
lithotripist (s) (noun), lithotripists (pl)
Someone who is skilled in the process of crushing and extracting stones located in the kidney or bladder: Isaac had to be treated by a lithotripist in order to get rid of the mineral crystals that were causing intense pain in his lower back and urinary tract infections.
lobbyist
1. Someone who is paid to lobby political representatives on an issue that is desired by the one who is paying the lobbyist.
2. Someone who tries to persuade legislators to vote for bills that the lobbyist favors.
locutionist
Someone who uses a particular form of expression, word, phrase, expression, or idiom.
logologist
Someone who studies words.
loyalist
luminologist (s) (noun), luminologists (pl)
1. Someone who studies the shimmering or glowing phenomena of lambency in living organisms: The Marine University hired Dr. Lawson, a renown luminologist, to chair the department which studied the underwater plant and animal life which produce a vivid luster.
2. A person who is versed in the study of books with colored illustrations: As a result of her artistic abilities and specialization in ancient manuscripts, Julie was hired by the library as a luminologist to catalogue and repair the illuminations in the manuscript collection.
lycanthropist (s) (noun), lycanthropists (pl)
Someone who is affected by the mental disease that involves thinking that he or she is a horse.
macrologist (s) (noun), macrologists (pl)
A dull conversationalist; usually, someone who is often at parties or other social gatherings.
maieutologist
1. A practitioner of maieutics.
2. An obstetrician.
malacologist
A specialist in malacology.
malacotomist
One who is versed in malacotomy.
manakophilist
One who collects almanacs.
manicurist (s) (noun), manicurists (pl)
1. Usually a beautician or someone who specializes in giving treatment of the fingernails; including, shaping and polishing: There are people who go to manicurists regularly for treatment of their fingernails and, sometimes, even for other conditions of their hands.

Someone once wrote that we should remember that only manicurists are literally making money "hand over fists".

2. Etymology: "a person who professionally treats hands and fingernails" which came from French manicure; literally, "the care of the hands"; from Latin manus, "hand" + cura, "care, treatment".