IPA: /ˈɡʌm.bɔːl/
KK: /ˈɡʌmˌbɔl/
A small, round candy that is made of chewing gum and usually has a colorful outer layer.
I picked a blue gumball from the machine at the store.
Gumball → The word is formed from "gum" (from Old English *guma*, meaning a sticky substance) and "ball" (from Old English *beall*, meaning a round object). A gumball is a round object made of a sticky substance, specifically candy.
Think of a 'sticky substance' ('gum') shaped into a 'round object' ('ball') — that's what a gumball is.