Observer

/ɒbzˈɜːvɐ/

/əbˈzɝvɝ/

Observer

an expert who observes and comments on something

a person who becomes aware (of things or events) through the senses

synonyms : beholder

Examples

1. After all, observers had seen some wave-like features in the upper atmosphere.

2. In this theory observers play no special role.

3. Everything, from its impressive size to the number of passengers on board, leaves unprepared observers speechless.

4. External observers have their opinions as well.