1. One who observes or takes notice; observer 
2. One who makes a remark

Derived forms: observators

• demolished
• demolishing
• demolition
• demon
• demon-ridden
• demonetisation
• demonetise
• demonetization
• demonetize
• demoniac
• demoniacal
• demoniacally
• demonic
• demonisation
• demonise
• demonism
• demonization
• demonize
• demonolatry
• demonology
• demonstrability
• demonstrable
• demonstrably
• demonstrate
• demonstrated