Answer: knur

AnswerCrossword Clue
KNURBump on a log
KNURTree growth
KNURGnarl.
KNURKnot in tree trunk.
KNURKnot in wood.
KNURGnarl on a tree.
KNURHard tree growth
KNURSylvan knot
KNURKnotty bump on a tree
KNURTree protuberance
KNURKnotty growth
knurknotty or hard protuberance or growth, as on a tree
knura knot of wood, also KNURR, NUR, NURR