空 空 kōng Strokes8 Radical 穴 — cave, den, hole Made of 穴 cave, den, hole 工 labor, work How it's builtPhono-semantic — one part hints at the meaning, another at the sound Play the animation
儿 儿 ér Strokes2 Radical 儿 — son, child How it's builtPictograph — a drawing of the thing Play the animation More about the character 儿