1. retro grade, step2. retro spect, look

se (sed) = aside.

1. se cede, go4. se duce, lead
2. se clude, shut5. se greg ate, flock
3. se cure, care6. se lect, gather

3. Secure. Free (aside) from care, as to danger or risk; as, secure from attack, or secure against loss by fire.

4. Seduce. To lead or draw aside; especially from a path of rectitude. To lead into evil.

5. Segregate. To place or group (flock) aside from others or the rest. In science, to put into a new or separate class.

sub = under, after, near.

(suc, suf, sug, sup, sur, are euphonic variations of sub.)

1. sub due lead11. sub terr anean, earth
2. sub jug ate, yoke12. sub trahe nd, draw
3. sub lunar, moon13. sub urbs, city
4. sub merge, plunge14. sub way, way
5. sub ordin ate, rank15. suc cess or, go
6. sub poena, penalty16. suc cumb, lie
7. sub scribe, write17. suf fer, bear
8. sub side, sit18. suf fix, fasten
9. sub soil, ground19. suf focate, throat
10. sub stance, stand20. sup port, carry

1. Subdue. To lead or bring under authority; to conquer.