Based on lose, new words formed by adding one letter at the beginning or end:
a - elos b - aloes c - boles d - close f - coles g - socle h - doles i - lodes j - soled k - floes l - loges m - helos n - holes o - hosel p - sheol r - solei s - koels t - moles u - enols v - lenos w - noels x - loose