Here are the words that differ from the others in terms of primary stress:

1. **C. repair** (The primary stress is on the second syllable: re-PAIR, while the others have stress on the second syllable)

2. **D. immediate** (The primary stress is on the second syllable: im-MED-iate, while the others have stress on the third syllable)

3. **A. attract** (The primary stress is on the second syllable: at-TRACT, while the others have stress on the first syllable)

4. **C. attention** (The primary stress is on the second syllable: at-TEN-tion, while the others have stress on the third syllable)

5. **B. accompany** (The primary stress is on the second syllable: ac-COM-pany, while the others have stress on the first syllable)

6. **C. protect** (The primary stress is on the second syllable: pro-TECT, while the others have stress on the first syllable)

7. **C. fertilizer** (The primary stress is on the first syllable: FER-tilizer, while the others have stress on the third syllable)

8. **D. waver** (The primary stress is on the first syllable: WAV-er, while the others have stress on the second syllable)

9. **C. economic** (The primary stress is on the third syllable: eco-NOMIC, while the others have stress on the second syllable)

10. **D. vaporize** (The primary stress is on the first syllable: VAP-orize, while the others typically have stress on the second syllable)

So the answers are:

1. C
2. D
3. A
4. C
5. B
6. C
7. C
8. D
9. C
10. D