1.
autobiographer
2.
speedometer
3.
thermometer
4.
photography
5.
oceanographer
6.
biographer
7.
paragraph
8.
geographer
9.
thermostat
10. geography
11. diameter
12. thermal
13. autograph
14. graphic
15. barometer
16. geology
17. biology
18. geologist
19. telegraph
20. geometry