"-titude" Words I Have Learned:

1. Altitude: upward distance
2. Aptitude: inherent ability to learn things
3. Attitude: manner of carrying oneself
4. Beatitude: supreme blessedness/happiness
5. Certitude: complete assurance
6. Colatitude: nautical complement of celestial latitude, (given latitude ~ 90°)
7. Correctitude: appropriate manners, propriety.
8. Exactitude: precision/accuracy
9. Fortitude: strength of mind, especially to courageously endure pain/adversity
10. Gratitude: thankfulness
11. Inaptitude/Ineptitude: inability/incompetence
12. Incertitude: uncertainty/insecurity/instability
13. Ingratitude: ungratefulness
14. Inexactitude: inexactness.
15. Latitude: angular distance north or south of the earth's equator
16. Midlatitude: middle latitude of Earth 
17. Multitude: very great number/masses
18. Plentitude: abundance 
19. Platitude: banal remark, especially expressed as if it were original. kinda like cliché
20. Promptitude: punctuality
21. Rectitude: moral/religious correctness
22. Senectitude: old age/elderliness
23. Vastitude: vastness of space

Let me know if there is/are anymore.