The term 'KIND OF ELEMENT' can be solved by two crossword solutions: TRACE (5 letters) and RAREEARTH (9 letters). TRACE is an abbreviation for TRACE elements, which are chemical elements that are present in very small amounts in the environment. TRACE elements are essential for the growth and development of living organisms. RAREEARTH is an abbreviation for rare earth elements, which are a group of 17 chemical elements found in the Earth's crust. These elements are used in a variety of applications, including electronics, automotive, and medical industries.