1. Alien
2. Visitor
3. Stranger
4. Entity
5. Being
6. Creature
7. Phenomenon
8. Phenomena
9. Unidentified Flying Object
10. Extraterrestrial
11. Interloper
12. Intruder
13. Outsider
14. Invader
15. Life Form
16. Off-worlder
17. Outworlder
18. Non-human
19. Non-earthling
20. Not of this World
21. Outlander
22. Transient
23. Transient Being
24. Wayfarer
25. Tourist
26. Foreigner
27. Foreign Entity
28. Unfamiliar
29. Unfamiliar Being
30. Unidentified Being

Searching for the best synonyms for the word “ET”? Look no further! Here are 30 ideas for other words you can use to express the same concept. From “alien” and “visitor” to “wayfarer” and “tourist”, these synonyms are sure to help you find the perfect word to express your meaning. Whether you’re looking for a more formal term or something more lighthearted and fun, this list has you covered. So the next time you’re looking for a way to express something that could be expressed with the word “ET”, consider using one of these synonyms instead.