A tree knot is a type of growth that appears on the trunk or branches of a tree. The crossword solutions for the term tree knot include KNAR (4 letters), KNUR (4 letters), GNARL (5 letters), BURL (4 letters), KNURL (5 letters), and KNAUR (5 letters). KNAR is an old word meaning to twist or turn, while KNUR is a variant of the same word. GNARL is a verb meaning to twist or curl in a gnarled manner. BURL is a noun referring to a lump or knot on a tree trunk. KNURL is a verb meaning to make a knot or lump on a tree trunk, and KNAUR is a variant of the same word.