18a the short strands and knots combed from wool before spinning (4) n?i?
20a form of impure amorphous carbon produced by the incomplete combustion of organic matter (4) s?o?
18a Googling suggests neps (if your I is wrong)
With high-quality combed wool, spinning wool this way makes a smooth, dense yarn. ... It was combed, but still contains a few tiny knots and neps.
www.wonderhowto.com/how-to-spin-wool-worsted-
style-short-draw-251605/
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