Needles or Nettles is a term used to describe two different types of plants. Needles are a type of coniferous tree, while Nettles are a type of flowering plant. Both plants have sharp, pointed leaves that can cause irritation when touched. Needles and Nettles are often found in the same areas, and both can be used for medicinal purposes. The crossword solution RILES is an acronym for 'Needles or Nettles'.