Based on aliens, new words formed by adding one letter at the beginning or end:
b - aeilns c - lesbian d - inlaces f - sanicle g - scaleni h - denials k - snailed l - finales m - leasing o - linages p - sealing r - inhales s - alkines t - ainsell u - malines v - menials w - seminal x - anisole y - alpines
