紡績
ぼうせき · bouseki · JLPT N1 · noun
spinning
🧵 紡 = spin thread (糸 silk-thread radical); 績 = spun fibres, merit. 紡績 = spinning thread into yarn.
Both characters carry the 糸 (silk thread) radical. 紡 means spinning fibre, and 績 means spinning or twisting fibre into thread, so the compound names the whole process of making yarn.