Pirn vs. Pian: What's the Difference?

A cone-shaped spool or bobbin on which thread or yarn is wound, used most often for weaving.

Yaws

The amount of thread wound on a shuttle or reel.

The yaws. See Yaws.

(transitive) To wind (yarn) onto a pirn, usually by means of a pirn winder.

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.