Based on gratine, new words formed by adding one letter at the beginning or end:
b - berating rebating tabering c - argentic catering creating reacting d - derating gradient redating treading h - earthing hearting ingather k - retaking l - alerting altering integral relating tanglier triangle m - emigrant remating p - retaping tapering s - angriest astringe ganister gantries granites ingrates rangiest v - averting grievant vintager w - twangier watering x - retaxing
