Final answer:
Homophones (b) are words that sound the same but have different spellings and meanings.
Step-by-step explanation:
Homophones refers to words that are spelled differently and have different meanings but sound the same. In this case, 'wrrr' and 'chutter' are examples of homophones because they sound the same but have different spellings and meanings.
Another option, synonyms, refers to words that have similar meanings. However, 'wrrr' and 'chutter' are not synonyms because they are not different words with similar meanings. They are simply different words with different meanings that happen to sound the same.
Therefore, the correct answer is homophones (b), as they sound the same but have different spellings and meanings.