observation towerˌobserˈvation ˌtower noun [countable] 
a tall structure built so that you can see a long way, used to watch prisoners, look for forest fires etc
a tall structure built so that you can see a long way, used to watch prisoners, look for forest fires etc- circuit court
- circuitous
- circuitously
- circuitry
- circuit training
- circular
- circular file
- circularity
- circular saw
- circulate
- circulation
- circulatory
- circumcise
- circumcision
- circumference
- circumflex
- circumlocution
- circumlocutory
- circumnavigate
- circumnavigation
- circumscribe
- circumspect
- circumspection
- circumspectly
- circumstance