Words created by adding a letter to the beginning or end of S
os, OS, ms, BS, SB, MS, SM, DS, PS, si, SL, SA, SC, Sc, sr, SE, SW, Ms, SI, SD, sh, SS, ISI, SSS, ESE, WSW, as, so, AS, US, KS, Sb, As, Cs, Ds, Es, Hs, Os, Sm, Sg, Se, Si, Sr, Sn, is are words created by adding a letter to 'S'