Based on ares, new words formed by adding one letter at the beginning or end:
a - aers b - areas c - baser d - braes e - sabre f - acres g - carse h - escar i - scare j - serac k - dares l - dears m - reads n - saree o - fears p - safer r - gears s - sager t - sarge u - hears v - rheas w - share x - arise y - raise z - serai