Echolot
echo sounding
Echelon
echelon
Cholop
kholop
Schlot
smokestack
funnel
chimney
diatreme
vent
ditch
Echo
echo
echt
genuine
Cholin
choline
Schönit
schönite
Acholie
acholia
Schoko
choc
Scholie
scholium
Scholle
plaice
clod
Schot
sheet
Schott
bulkhead
partition
separation
verholzt
woody
Ethologe
ethologist
behavior scientist
Tholos
tholos
erholen
relax
recover
Cölom
coelom
Helot
helot