1. graph
2. graphics
3. bibliography
4. homograph
5. seismograph
6. graphite
7. monograph
8. holograph
9. topograph
10. television
11. telecast
12. telepathy
13. telephoto
14. telemetry
15. televise
16. microbiology
17. microcosm
18. microchip
19. microbe
20. microwave