calix calif
calx calf
dexter defter
ex ef
exit efit
exits efits
fixed fifed
fixer fifer
fixers fifers
fixes fifes
fixing fifing
kex kef
ox of
oxfence offence
rax raf
rex ref
rexine refine
saxe safe
saxes safes
waxer wafer
waxers wafers
xaxes faxes
xeres feres
xray fray
xrayed frayed
xraying fraying
xrays frays