Based on sterna, new words formed by adding one letter at the beginning or end:
b - banters c - canters carnets nectars recants scanter tanrecs trances d - stander g - argents garnets strange h - anthers thenars i - anestri antsier nastier ratines retains retinas retsina stainer stearin k - rankest tankers l - antlers rentals saltern sternal m - martens sarment smarten o - atoners senator treason p - arpents entraps parents pastern trepans u - natures saunter v - servant taverns versant w - wanters