What do the following words have in common?

1. Bar
2. Eye
3. Soup
4. Lake
5. Tail
6. Hole
7. Walk
8. Directions

HINT:
Each word can be preceded by a related word.

Answer:

Each word can be preceded by the name of a bird:

1. Crow bar
2. Eagle eye
3. Duck Soup
4. Swan Lake
5. Dovetail
6. Pigeonhole
7. Jaywalk
8. Cardinal directions