-ist

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

vexillologist (vek" suh LAHL luh jist) (s) (noun), vexillologists (pl)
A person or those who study and research information about colors: The vexillologists met to share their knowledge about the many ancient and other historical bannerets that have existed throughout the centuries.
vexillophilist (s) (noun), vexillophilists (pl)
Anyone who has a special interest or fondness for flags of all kinds: Apparently vexillophilists have strong desires to collect all kinds of banners because of their shapes, designs, colors, and representations from the earliest times until the present.
vicambulist (s) (noun), vicambulists (pl)
Someone who strolls or wanders around on a street.
vicinist (s) (noun), vicinists (pl)
A person (or people) who is a member of the same community as someone else or as other people are: Tom and Trish were vicinists who lived in a well-to-do district or vicinity with other members of their families and friends.
viniculturist (s) (noun), viniculturists (pl)
virilist
A hearty, excessively "manly" person; one who makes a cult of conventional masculine virtues.
virologist
vitagonist
A vitamin antagonist; a substance that produces deficiency of a given vitamin.
viticulturist
vivisectionist
Someone who practices, or advocates, operating on live animals for scientific or medical research.
vocabulist (s) (noun), vocabulists (pl)
The writer or compiler of word entries that are listed and usually defined; a lexicographer: Noah Webster is one example of a vocabulist who compiled An American Dictionary of the English Language, which was first published in 1897!
vocalist (s) (noun), vocalists (pl)
Someone who has a cultivated or trained voice; a singer: Many musical performances include successful vocalists who sing modern renditions of songs or in operas.
volcanologist, volcanist
Someone who is a specialist in the study of volcanic phenomena.
voluntarist
xenoepist
Someone who speaks with a foreign accent.