50 Greek and Latin roots

 Latin
1. canis: dog; canine
2. feles: cat; feline
3. equus: horse; equestrian
4. caballus: horse; cavalry
5. porcus: pig, swine; pork
6. avis: bird; aviation
7. grex gregis: flock, herd, group; congregation
8. omnis: each, every all; omnipotence
9. ambi: on both sides; ambidextrous
10. malus: bad. ugly; malice
11. e-ex: out of, beyond, from; exit
12. arcus: bow, arc; arc
13. circum: around, about; circle
14. deus: god; deity
15. divinus: god-like; divine
16. homo hominis: man, human being; human
17. vir: man, manly; virile
18. femina: woman; female
19. infans infantis; inability to speak; infant
20. ludo lusus: play, mock; illusion
21. medicus: physician: medicine
22. sanus: healthy, not diseased; sanitary
23. cornu: horn; unicorn
24. cutis: skin, hide; cuticle
25. cor cordis: heart; courage
26. dorsum: back: dorsal
27. mons montis: mountain; mountain
28. humus: earth, soil; humility
29. folium: leaf, foliage
30. sal salis: salt; salt
31. mare: sea. ocean; marine

Greek:

1. leon: lion; lion
2. hippos: horse; hippopotamus
3. ornis ornithos: bird; ornithology
4. amphi: both; amphibian
5. archos: chief, principal; archbishop
6. kyklos: ring, circle; cycle
7. peri: around; perimeter
8. theos: god; theology
9. anthropos: man, mankind; anthropology
10. pais paidos: child; pediatrician
11. schole: leisure, free time; school
12. iatros: doctor; psychiatrist
13. holos: whole, entire; whole
14. rhinos: nose, snout; rhinoceros
15. derma: skin, hide; epidermis
16. athlon: prize, award; athlete
17. agon: contest, struggle; agony
18. dromos: race course, runway; hippodrome
19. eu: well, good; eulogy