Sorry, no online dictionaries contain the exact phrase makes certain that.
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Reverse dictionary results:
1. assures
2. resolver
3. guarantee
4. model
5. surety
6. steels
7. insurer
8. lysine intolerance
9. account
10. animator
11. ans
12. assert
13. beard
14. bends
15. brain
16. bus
17. byssus
18. condition
19. decided
20. earth
21. endospore
22. eod
23. figure
24. form
25. get
26. grip
27. ground
28. grounded
29. hob
30. horn
31. lamp
32. life
33. loading
34. mak
35. make
36. man
37. may
38. mute
39. nose
40. nova

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You can look up the words in the phrase individually using these links:   makes ?   certain ?   that ?
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