Final answer:
Option (b) 'Synonyms are spelled the same but have different pronunciations and meanings' is NOT true about synonyms; it actually describes homographs. Synonyms have similar meanings, while antonyms have opposite meanings.
Step-by-step explanation:
The option that is NOT true about synonyms and antonyms is: b) Synonyms are spelled the same but have different pronunciations and meanings. This statement actually describes homographs, not synonyms. Synonyms are words that have the same or similar meanings and can be used interchangeably in some contexts to provide more precision in writing.
They do not necessarily have the same spelling. On the other hand, antonyms are words with opposite meanings. Both synonyms and antonyms function as the same part of speech within sentences. Being aware of these distinctions is essential to avoid confusion and improve the clarity of your writing.