cepillo
/θeˈpiʝo/ · B2 · noun · m
brush
🪥🪚 cepo (wooden block) + -illo (little) = little block: a brush or a plane
The ending sounds like pillow: you brush the pillow. Cepillo comes from cepo, a wooden block or stump. Brushes and carpenter's planes were both small wooden blocks, and a church's poor box was a hollowed-out block too. Cepillo de dientes means toothbrush.