Which of the following describes what synonyms must have in common? They must be nouns. They must sound the same. They must be the same part of speech. They must mean different things.

They must mean different things.

Explanation:

They must be the same part of speech.

Explanation:

A is wrong because not only nouns can have synonyms e.g. happy, excited

B is wrong because they do not have to sound the same e.g. food, vittles

C is correct because they have to mean the same and that would not happen if they were not the same part of speech

D is wrong because synonyms mean the same, antonyms mean different things. e.g. sad, disappointed

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