• 毛け — hair / fur
• 髪の毛かみのけ — hair (on head)
• 毛布もうふ — blanket
• 毛糸けいと — wool yarn
• 羽毛うもう — feathers / plumage
• 脱毛だつもう — hair removal

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• 羊毛ようもう — wool
• 毛皮けがわ — fur / pelt
• 産毛うぶげ — down hair / peach fuzz
• 毛深けぶかい — hairy
• 毛虫けむし — caterpillar
• 毛筆もうひつ — writing brush
• 不毛ふもう — barren / unproductive
• 毛頭もうとう — not in the least / not at all
• 逆毛さかげ — hair standing on end / teasing hair

Commonly used in biology, grooming, and clothing. It can also appear in abstract uses such as describing tiny amounts or small signs of something.