Sorry, no online dictionaries contain the exact phrase opposite of quack.
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Reverse dictionary results:
1. fake
2. fraud
3. remedy
4. sham
5. pawn
6. real
7. bootleg
8. bootlegging
9. check
10. cleave
11. deke
12. fob
13. ftc
14. hacking
15. impose
16. juke
17. lop
18. mask
19. meter
20. office
21. olaf
22. paum
23. amateur
24. certified
25. criminal
26. doctor
27. duck
28. hack
29. herbal
30. jockey
31. juggler
32. pretender
33. qualified
34. smuggler
35. charlatan
36. empiric
37. faker
38. medicaster
39. mountebank
40. nostrum

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You can look up the words in the phrase individually using these links:   opposite ?   of ?   quack ?
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Not helpful? You might try using the wildcards * and ? to find the word you're looking for. For example, use
oppo*to search for words beginning with oppo, or
*uackto search for words ending with uack
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