rope

縄(なわ)	Rope – jump-rope, ‘do-not-enter’ rope, bondage rope. $$$

糸(いと)	String

綱(つな)	Rope... the thickest of the three, which typically has the most vital jobs.

命綱(イのちのつな)	Lifeline, leash, tightrope, mooring line (ties boat to dock). LIT