| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| discover the best books on alien worlds | 1.02 | 0.8 | 4991 | 52 |
| best books on aliens | 0.02 | 0.6 | 3987 | 61 |
| best alien books fiction | 1.57 | 0.9 | 2960 | 53 |
| books about aliens on earth | 1.64 | 0.3 | 1727 | 43 |
| best books on ancient aliens | 1.68 | 0.5 | 2057 | 6 |
| best novels about aliens | 0.66 | 0.5 | 8445 | 3 |
| best books about alien contact | 1.1 | 0.1 | 8785 | 84 |
| aliens books series books | 1.75 | 0.9 | 4346 | 97 |
| books written by aliens | 1.77 | 0.7 | 4993 | 33 |
| alien adventure in books | 1.03 | 0.6 | 6813 | 24 |
| best alien encounter books | 1.27 | 1 | 2171 | 22 |
| books on aliens involving with humans | 0.2 | 0.8 | 3374 | 49 |
| best sci fi books about aliens | 1.77 | 0.2 | 4593 | 16 |
| fiction books about aliens | 0.39 | 0.1 | 3989 | 67 |
| science fiction alien books | 1.79 | 0.2 | 6793 | 67 |
| alien books for kids | 0.54 | 0.5 | 6789 | 68 |
| books about aliens for kids | 0.05 | 0.2 | 3386 | 85 |
| best sci-fi book series with aliens | 1.18 | 0.5 | 5325 | 85 |
| aliens from earth book | 1.31 | 0.3 | 8645 | 76 |
