Pirn vs. Pian: What's the Difference?

Pirn and Pian Definitions
Pirn
A cone-shaped spool or bobbin on which thread or yarn is wound, used most often for weaving.
Pian
Yaws
Pirn
The amount of thread wound on a shuttle or reel.
Pian
The yaws. See Yaws.
Pirn
(transitive) To wind (yarn) onto a pirn, usually by means of a pirn winder.
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Pirn
A quill or reed on which thread or yarn is wound; a bobbin; also, the wound yarn on a weaver's shuttle; also, the reel of a fishing rod.