different between quills vs quilly

English

quills

From quill +? -y.

quilly (comparative more quilly, superlative most quilly)

Pertaining to or resembling a quill. [from 16th c.]
- 1665, Robert Hooke, Micrographia, XXXVIII:
  The fabrick of the wing, as it appears through a moderately magnifying Microscope, seems to be a body consisting of two parts […]; the one is a quilly or finny substance, consisting of several long, slender and variously bended quills or wires, something resembling the veins of leaves […].
With quills; quilled. [from 18th c.]
- 2005, Jean M. Thompson, Wild Kindred of Fur, Feather and Fin (page 79)
  […] sometimes you may even run across a quilly ball lying right on top of the ledge, or catch one of the numerous porcupine family picking its way leisurely among the rocks.

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