Verified Answer :

A synonym is a word that is similar in meaning  - the correct answer is A. "speak" and "talk" are synonyms.

The other answers can be confusing, I will explain why:

B: pronounced the same : this is a homonym. For example, "write" and "right" are homonyms.

C: these are antonyms: for example big and small are antonyms.

And as far as D is concerned: all words should be defined in Thesaurus!

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