Here are the words with a different sound in the underlined part:

1. **A. lazy** (the 'a' in "lazy" is pronounced as /eɪ/, while the rest are pronounced with /eɪ/ in "date" and "hate" and /ɑː/ in "car").

2. **A. said** (the 'ai' in "said" is pronounced as /ɛ/, while the others "wait," "train," and "paid" have the /eɪ/ sound).

3. **D. chat** (the 'a' in "chat" is pronounced as /æ/, while the rest "safety," "waste," and "taste" have the /eɪ/ sound).

4. **D. centre** (the 'e' in "centre" is pronounced as /ɛ/, while the others "security," "belt," and "let" have the /ɪ/ sound in their respective vowel sounds).

5. **D. weather** (the 'ea' in "weather" is pronounced as /ɛ/, while "head," "seat," and "heavy" have different vowel sounds: /ɛ/, /iː/, and /ɛ/ respectively, but the difference is sharper in 'weather' due to the diphthong).

So the words with different sounds are:
1. A (lazy)
2. A (said)
3. D (chat)
4. D (centre)
5. D (weather)