Chinese words with 丝 character meaning (HSK)

丝绸

SI1, CHOU2
silk cloth, silk

丝毫

SI1, HAO2
the slightest amount or degree, a bit

一丝不苟

YI4, SI1, BU4, GOU3
not one thread loose (idiom), strictly according to the rules, meticulous, not one hair out of place