IPA: /ˈwaɪtənər/
KK: /ˈhwaɪtənər/
A substance or product used to make something whiter, often used in laundry or as a non-dairy creamer for beverages.
She added a whitener to her laundry to make the clothes brighter.
Whitener → It is formed from "white" (from Old English "hwita", meaning bright or light in color) and "-ner" (a suffix used to indicate a person or thing that performs a specific action). The word "whitener" refers to something that makes or causes something to become white or brighter.
Think of something that makes things 'white' — 'white' means bright, and '-ner' indicates a person or thing that does something. A whitener is something that brightens or whitens.