observer
Translation
observer, onlooker, spectator, commentator
Examples
She is a keen observer of human behavior.
She is a keen observer of human behaviour.
An international observer was present at the election.
An international observer was present at the election.
Grammar Patterns
an observer of ((sth.)) a person who watches (sth.) She is a keen observer of human behaviour.
Similar Words
Synonyms: spectator, watcher, onlooker
Etymology
From Latin 'observare' (to watch). 'ob-' (towards) + 'servare' (to watch, keep). The '-er' suffix denotes a person who performs the action.
Memory Tips
Simply remember it's a person (-er) who does the action of 'observe'.