Yerk is a 4 letter English word. It's valid Scrabble word worth 11 points. It's valid Words with friends word worth 10 points.
You can make 23 anagrams from letters in yerk (ekry).
1400-50; late Middle English
But Whiffle never could acquit yerk of having been, directly or indirectly, the cause of his suffering from the impure shower.
George bit his lip, scratched his head with the awl, and gave the lingles such a yerk, that he made them both crack in two.
But an I get the first yerk of a chield, I'm no unco feared for his return.