The term 'KNOTTY, AS A TREE' can be described as GNARLED, which is a 7-letter word. GNARLED is an adjective used to describe something that is twisted, distorted, or tangled. It is often used to describe trees that have grown in an irregular shape due to weathering or other environmental factors. The term 'KNOTTY, AS A TREE' is often used to describe trees that have grown in a twisted and distorted manner.