To identify the word with a different stress pattern, let's analyze the options:

1. **visit** - stress on the first syllable (VIS-it)
2. **deny** - stress on the second syllable (de-NY)
3. **explore** - stress on the second syllable (ex-PLOR)
4. **happen** - stress on the first syllable (HAP-pen)
5. **disturb** - stress on the second syllable (dis-TURB)

6. **agree** - stress on the second syllable (a-GREE)
7. **suggest** - stress on the second syllable (sug-GEST)
8. **offer** - stress on the first syllable (OF-fer)
9. **preserve** - stress on the second syllable (pre-SERVE)
10. **impress** - stress on the second syllable (im-PRESS)

11. **access** - stress on the first syllable (AC-cess)
12. **avoid** - stress on the second syllable (a-VOID)
13. **create** - stress on the second syllable (cre-ATE)
14. **protect** - stress on the second syllable (pro-TECT)
15. **manage** - stress on the first syllable (MAN-age)

From this analysis, the differing stress pattern can be noted:

- For **visit**, **happen**, **offer**, **access**, and **manage**, the stress is on the first syllable.
- For **deny**, **explore**, **disturb**, **agree**, **suggest**, **preserve**, **impress**, and for several in the second set, the stress is consistently placed differently.

The word with a different stress pattern is **"offer"**, as it has a primary stress on the first syllable while others generally have the primary stress on the second syllable.

Thus, the answer is "offer".