IPA: /moʊˈzeɪɪst/
KK: /məʊˈzeɪɪst/
A person who creates or arranges small pieces of colored materials to form a picture or pattern.
The mosaicist spent hours carefully placing each tile to create a beautiful mural.
Mosaicist → It is formed from "mosaic" (from Latin *mosaicum*, meaning a work of mosaic) and "-ist" (meaning one who practices or is concerned with). A mosaicist is someone who creates or works with mosaics, which are artworks made from assembling small pieces of colored glass, stone, or other materials.
Think of a person who creates beautiful artworks from small pieces ('mosaic') — that's what a mosaicist does.
No commonly confused words.