-isto

Etymology
From.

Suffix

 * 1) a person who is occupied with, often but not necessarily implying a professional occupation
 * 2) a person who follows an ideology or doctrine (often following a corresponding )
 * 1) a person who follows an ideology or doctrine (often following a corresponding )
 * 1) a person who follows an ideology or doctrine (often following a corresponding )
 * 1) a person who follows an ideology or doctrine (often following a corresponding )
 * 1) a person who follows an ideology or doctrine (often following a corresponding )
 * 1) a person who follows an ideology or doctrine (often following a corresponding )

Usage notes
It is important to distinguish between an, someone who is doing something at the moment, and an , someone whose occupation it is to do something. For example, if you are cooking dinner, you are a. If you are employed as a chef, you are a. This often implies a professional occupation, but not necessarily. E.g. and  also frequently refer to hobbyists.

Also note that in Esperanto, membership is denoted by. For example, a colonist is a, whereas would signify an advocate of colonialism.