| state secret | 27.06 | State secrets? | ||
| nuclear secret | 9.68 | Engineer accused of selling nuclear secrets. | ||
| military secret | 9.55 | China steals our military secrets. | ||
| guarded secret | 6.91 | These are closely guarded secrets now. | ||
| dark secret | 4.34 | But Hugh harbors a dark secret. | ||
| little secret | 4.21 | This was my little secret. | ||
| top secret | 4.15 | Top secret. | ||
| family secret | 3.49 | It is not a family secret. | ||
| leaking secret | 3.23 | She was charged with leaking state secrets. | ||
| well-kept secret | 2.37 | This is a well-kept secret of the experts. | ||
| big secret | 2.30 | The big secret? | ||
| american secret | 1.97 | He was firmly opposed to China stealing American nuclear secrets. | ||
| national secret | 1.65 | Details of it are a top national secret. | ||
| worst-kept secret | 1.58 | It is perhaps the worst-kept secret in Germany. | ||
| best-kept secret | 1.51 | Money, however, is the best-kept secret. | ||
| real secret | 1.51 | The real secret? | ||
| held secret | 1.38 | His decision to retire was a closely held secret. | ||
| official secret | 1.32 | A man was charged today with leaking official secrets. | ||
| dirty secret | 1.25 | But it had a dirty secret. | ||
| great secret | 1.25 | No great secret. |