Based on stonier, new words formed by adding one letter at the beginning or end:
a - notaries b - senorita c - bornites e - cointers g - corniest h - noticers j - oneriest k - serotine l - genitors n - horniest o - ornithes p - jointers r - instroke s - retinols t - intoners u - ternions v - snootier y - pointers