Pirn is a 4 letter English word. It's valid Scrabble word worth 6 points. It's valid Words with friends word worth 8 points.
You can make 26 anagrams from letters in pirn (inpr).
1400-50; late Middle English pyrne
Fathom after fathom goes reeling from your pirn, but still you are barely able to drop the far fly into the distant curl.
Na, he juist said he'd forgotten a pirn, or his cruizey lamp, or ony thing.
"Ay, mony a pirn has 'Lisbeth filled to me," said Hendry, settling down to a reminiscence.
The first thing he saw was a half-finished reel of cotton—a pirn, he called it.
So she spun at her yarn, and found more yarn on the “pirn” than she thought to find; which frightened her.