Is FBI an acronym or abbreviation?

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Tags

1. #formed
2. #between
3. #investigation
4. #pronounced
5. #bureau
6. #video
7. #individual
8. #intelligence
9. #initialisms
10. #acronym
11. #letters
12. #difference
13. #agency
14. #digital
15. #initialism
16. #abbreviation
17. #federal
18. #central
19. #rather