Skip to main content

Home Vocabulary Quiz

Master 3500+ IELTS vocabulary words with spaced repetition and adaptive quizzes. Free forever.

PlatformAbout Us Contact Us Feedback Terms & Conditions Privacy Policy

Study TipsOur Methodology Spaced Repetition How to Learn Vocab Topic-Based Lists

GuidesBand Score Guide IELTS Test Format Academic vs General Writing Criteria Speaking Criteria Listening & Reading

Free ResourcesIELTS Practice Tests British Council Prep IDP IELTS Prep Cambridge IELTS Band Score Guide British Council Vocab IDP 500+ IELTS Words

Created with by Abu Bokkor Siddik

© 2026 IELTS Vocabs

observer

noun

intermediate

General English

Definition

a person who watches or notices something

Example Sentence

"He was an observer at the meeting."

Synonyms

watcher

spectator

witness

Antonyms

participant

IELTS Module Focus

reading

writing