Spinning
Yarn Spinning
noun, する verb
Spinning exploits sheep, but you keep spinning anyway because you're cold and you need the sweater you're making.
ぼうせき
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
牽切紡績とは、化学繊維特有の紡績方法で、綿からの紡績ではありません。
Kensetsu bouseki is a spinning method particular to synthetic fibers not spun from cotton.