Why can Hodor only say Hodor?

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Tags

1. #result
2. #warging
3. #hodor
4. #words
5. #mentally
6. #everyone
7. #seemingly
8. #accidentally
9. #young
10. #calls
11. #stark
12. #nonsense
13. #vision
14. #disabled
15. #became
16. #seizure
17. #process
18. #future
19. #though
20. #phrase
21. #derived
22. #during
23. #heard