Noun
1. cover-up
2. camouflage
3. deception
4. facade
5. veneer
6. pretext
7. blame game
Verb
9. sweep under the carpet
10. hush up
11. suppress
12. draw a veil over
13. conceal
14. veil
15. obscure
16. keep secret
17. gloss over
18. downplay
19. soft-pedal