Some four letter words starting with S and ending with F are:selfserfsurf
amok
Nonexistant
lime !
There are no English words that meet the criteria.
Afghanistan and Azerbaijan.
Anna
Some four letter words starting with S and ending with F are:selfserfsurf
amok
quos
Mump.
Nonexistant
inch
buzzzz:)
Alae
jazz
Avid