Aphabetic letter pairs in words

RS = rhinoceros

RT = repugnant

RU: rondeau

RV = rev

RW = rainbow

RX: reflux

RY = rickety

RZ - razz

SA = soda

SB - sob

SC - sadistic

SD = shroud

SE - sometime, somewhere, someplace, someone

SF- scoff

SG - snowing

SH = shush

SI: spaghetti

SJ - Sij, either of two Iranian villages

SK = silk

SL = sepulchral