The term 'scratch the surface of' can be represented by three crossword solutions: MAR (3 letters), SCARIFY (7 letters), and ETCH (4 letters). MAR is an abbreviation for 'MARK, ' which means to make a visible impression or trace on a surface. SCARIFY is a verb meaning to make small cuts or scratches on a surface. Lastly, ETCH is a verb meaning to carve or engrave a design into a surface. All three words refer to making marks on a surface, but with different levels of intensity.