A "perfector" refers to someone or something that brings about improvement or completion. It indicates a person or an object that is responsible for making something better or achieving the desired outcome. Full definition
Powder: Urban Decay Naked Illuminated Powder in Aura or the Becca Shimmering Skin Perfector Pressed in Champagne Gold (instyle.com)
Quick face breakdown: Kjaer Weis Desired Glow cream blush (love), Becca shimmering skin perfector in Opal (also love, but I like a lot of other highlighters as well. (theseventhsphinx.com)
Garnier SkinActive's 5 - in - 1 Miracle Skin Perfector BB Cream can easily conceal your blemishes to reveal a glowing complexion. (garnierusa.com)