Here are the words from each group where the main stress is different from the others:

1. **C. favourite** (stress on the first syllable, unlike the others).
2. **B. publish** (stress on the first syllable, while the others stress the second).
3. **B. neighbour** (stress on the first syllable, while the others stress the second).
4. **C. relation** (stress on the second syllable, unlike the others).
5. **C. sculpture** (stress on the first syllable, while the others emphasize differently).
6. **A. village** (stress on the first syllable, while the others differ).
7. **B. interview** (stress on the first syllable, while the others differ).
8. **B. characterize** (stress on the third syllable, unlike the others).
9. **A. traffic** (stress on the first syllable, while the others differ).
10. **C. experience** (stress on the second syllable).
11. **B. gallery** (stress on the first syllable, while the others differ).
12. **A. apartment** (stress on the second syllable).
13. **B. visit** (stress differs from the others).
14. **C. variety** (stress on the second syllable, unlike the others).
15. **D. forbidden** (stress on the second syllable, unlike the others).

These choices are based on the differences in syllable stress among the options provided.