-ist

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

xylophagist
1. Organisms which eat wood; those thriving on wood as a source of food; such as, certain molluscs, insects, and fungi.
2. Eating or boring into wood, as the larvae of certain insects.
Insects showing xylophagy.
These eager xylophagous insects are showing us just what xylophagy is all about.
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xylophonist
One who plays a xylophone.
xylopolist
1. One who sells timber; a timber-merchant.
2. A dealer in wooden objects or one who sells various kinds of wood or wooden objects.
xylotomist
That which cuts or pierces wood; such as, an insect.
yappophilist
A collector of limp-leather books.
zelotypist (s), zelotypists (pl) (noun forms)
Someone who is characterized, or marked, by excessive zeal that is carried to the verge of insanity, in the advocacy of some cause.
zoiatrist
Someone who specializes in the medical treatment of animals; more commonly known as a veterinarian.
zoologist
A scientist specializing in the discipline of zoology; an expert in zoology.
zoomantist
Someone who uses animal behavior as a means of predicting future events.
zoometrist
A specialist who uses statistical methods in the study of animals.
zoonomist
A specialist in the laws of animal life.
zoonosologist
1. One who classifies the diseases of animals.
2. A specialist in the diseases of animals.
zoopraxographist (s), zoopraxographists (pl) (nouns)
Someone who is a specialist in the subject of the way animals make progress from one position to another one: A zoopraxographist studies and records the various ways certain animals walk and run.
zootheist (s) (noun), zootheists (pl)
1. A person who believes a god is in the form of an animal.
2. Those who worship animal gods.
zootomist
A comparative animal anatomist.