Word in a Word!

1. ROSE
2. SPICE
3. APE
4. ENACT
5a. MOANING
5d. MATH
6. GIANT
7. ORBIT
8a. SOBER
8d. SPINSTER
9. IRON
10. RUBLE
11a. GAIN
11d. GIFT
12. TEEN
13. PARODY
14. CAROL
15a. TOUT
15d. TURTLE
16. THIN
17. WORD
18. PROTEIN
19. TUNA
20. PLANE