headteacher
principal
head
head teacher
school principal
housemaster
bursar
gynaecologist
headmistress
obstetrician
registrar
secretary-general
surgeon-general
undersecretary
Astor
Castor
Grandmaster
Master
aster
blaster
caster
castor
disaster
faster
gaster
grandmaster
laster
master
mcmaster
oleaster
paster
pastor
pilaster
plaster
raster