For the first group of words:

1. **supermarket** - stress on the first syllable (SU-permarket)
2. **community** - stress on the second syllable (com-MU-nity)
3. **environment** - stress on the second syllable (en-VI-ronment)
4. **imperative** - stress on the second syllable (im-PER-at-ive)

The word with a different stressed syllable is **supermarket**.

For the second group of words:

1. **station** - stress on the first syllable (STA-tion)
2. **bottle** - stress on the first syllable (BOT-tle)
3. **reuse** - stress on the second syllable (re-USE)
4. **donate** - stress on the first syllable (DON-ate)

The word with a different stressed syllable is **reuse**.