Based on retinas, new words formed by adding one letter at the beginning or end:
a - antisera b - ratanies c - seatrain d - banister e - barniest f - canister g - ceratins h - cisterna i - creatins k - scantier l - tacrines m - detrains n - randiest o - strained p - arenites r - arsenite s - resinate t - stearine u - trainees w - fainters
