Theory:

Whentwo different words are combined to form a new word, it is called as combined/compound words.
Example:
Honey and buns are combined to form "honeybuns".
Brain and storm are combined to form "brainstorm".
Full and moon are combined to form "full moon".
Window and sill are combined to form "window sill".
The following are the compound words from the lesson:
  
1. Outhouse.
2. Riverbed.
3. Waterfall.
4. Flower garden.
5. Sunshine.
6. Aerial roots.
7. Busybody.
8. Window sill.
9. Foothills.
10. Compound wall.
11. Showoffs.
12. Crow pheasant.