1. Ace
2. Ace of Spades
3. Alpha
4. Apple
5. Ball
6. Blue
7. Circle
8. Doughnut
9. Egg
10. Eight
11. Eye
12. Fig
13. Globe
14. Hole
15. Jack
16. King
17. Letter
18. Nought
19. Numerical
20. Octagon
21. Octopus
22. Orb
23. Oval
24. Queen
25. Ring
26. Round
27. Sphere
28. Symbol
29. Zero
30. Zero-Sum

Finding synonyms for a single word can be a difficult task. Whether you’re looking for a new way to express yourself in writing, or you’re a student looking for different words to use in an essay, there are plenty of ideas and other words for you to explore. The best ideas for synonyms for the word “O” include ace, ace of spades, alpha, apple, ball, blue, circle, doughnut, egg, eight, eye, fig, globe, hole, jack, king, letter, nought, numerical, octagon, octopus, orb, oval, queen, ring, round, sphere, symbol, zero, and zero-sum. All of these words provide a unique way to express the same concept. Whether you’re writing creatively or academically, these synonyms can help you find the right words to express yourself.