SO:-
1.
2. Spetsnatz
3.
4.
5. Herpetology
6. Petition
7. Carpet
8.
9. Trumpet
10. Petunia
11.
12. Petula Clark
13.
14. Petroleum
15.
16.
17. Petanque
18.
19. Impetigo
20. St Petersburg - Would Petrograd be accepted?
21. Limpet
22. Perpetual
23.
24. Petrel
25. Blue Peter
26.
27.
28. Petra Kvitova
29. Petr Cech
30. Peterhead (I said it first. )