Four letter words that begin with S and end with M are:
For starters,
Mirror, maker, monitor, memoir, manager, mother, messenger, meander, murder.
rays, rams, ribs, rues, rags, raps, rods,
room
room
Murder
Sham, Scam
Czar is a 4 letter word. It begins with C and ends with R.
icebreaker. illustrator. inventor. isomer.
Rien.
pear
alpine fir
Realism
There could be multiple answers to this. RACISM is one such word starting with R and ending with M.
A word that starts with S and ends with X is sphinx.
The longest word that starts with an "s" and ends with an "r" is "supercomputer."
rondeau
rondeau
jar...
7 letter S words ending with M:serfdomsymptomsynonymsarcasmsanctumsunbeam
Czar is a 4 letter word. It begins with C and ends with R.
rutabaga
rotunda
Rota