What type of cord...

[Sentryduty]

Is the term "Chandlers" used in North America for a shop selling boat accessories?

As a former Maritimer that grew up around Digby and Annapolis Royal, I will have go with no, never heard the term prior to now. Watercraft accessories were obtained from Sail Shops, Boat Shop, or Boat Works, anythings larger was sourced from Shipworks and Marine Industry.
For a time when I was younger my Father was employed by a boatworks, and 30 years ago a surprising amount of stuff was still crafted from scratch using coal and forgework for the scallop dragger fleet.