Brygun of the BAC here
With 3.60 beta hitting now might be a good time to suggest (or reiterate?) adding "string" as a base object.
Cord sounds alot like cordage which can be twisted bark, spruce roots or other low cost production. Used for things were a moderate strength is okay and there is no need to be slender.
String sounds like bowstring being a more finely crafted item making it better used in some tools or weapons like bows or other things were quality matters.
Rope would still be the big and strong item giving you strength at a higher resource cost.