Clumps of fabric fibers, often found on clothing or in dryers.
There's a lot of fluff on the sweater.
dustball; ball of dust
A small, roundish accumulation of dust and fibers, often found under furniture.
Dustballs had collected under the bed.
Full kanji spelling; less common but still seen.
Compound of 綿 (cotton, fibers) and ほこり (dust).