a suffix of nouns that denote a person who practices or is concerned with something, or holds certain principles, doctrines, etc.: enthusiast;ecdysiast; gymnast.
Here’s When to Capitalize Words
There are a few specific cases where words should be capitalized. They’re easy to remember. In English, capital letters are most commonly used at the start of a sentence, for the pronoun I, and for proper nouns. The First Word of a Sentence You should always capitalize the first letter of the first word in a sentence, no matter what the word is. Take, for …
Origin of -ast
a variant of -ist after the vowel i; from Greek -astēs
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
agential suffix, cognate with -ist, from French -ast, from Latin -asta, from Greek -astes.
Online Etymology Dictionary, © 2010 Douglas Harper