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- inclusive
- incognito
- incoherence
- incoherent
- incoherently
- income
- incomer
- income support
- income tax
- incoming
- incommunicado
- incomparable
- incomparably
- incompatibility
- incompatible
- incompetence
- incompetent
- incompetently
- incomplete
- incompletely
- incompleteness
- incomprehensibility
- incomprehensible
- incomprehensibly
- incomprehension