Based on respot, new words formed by adding one letter at the beginning or end:
a - eoprst c - esparto d - proteas h - seaport i - copters j - prosect l - deports m - redtops n - sported o - pothers p - strophe r - thorpes s - prostie t - riposte u - ropiest w - projets x - petrols z - replots
