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

Derived forms: observators

• frontier
• frontier settlement
• frontiersman
• frontierswoman
• frontispiece
• frontlet
• frontmost
• frontstall
• frontward
• frontwards
• frore
• frosh
• frost
• frost fish
• frost heave
• frost heaving
• frost mist
• frost over
• frost snow
• frost up
• Frost's bolete
• frost-bound
• frostbite
• frostbitten
• frosted