also: めんもう
noun
Refers to soft, fine, fluffy fibers such as plant down (e.g., dandelion seeds), animal undercoat, or lint-like fuzz on fabric.
タンポポの綿毛が風に飛ばされた。
The dandelion fluff was blown away by the wind.
セーターに綿毛がついている。
There is fuzz on the sweater.
毛羽 refers specifically to the nap or fuzz that rises from the surface of fabric, while 綿毛 is a broader term for any soft, fluffy fiber.
Compound of 綿 (wata, 'cotton') and 毛 (ke, 'hair'), referring to cotton-like fine hairs.