The two words that are closest in the meaning are option B and D: Masticate and Gnaw.
A synonym is a word or phrase that means exactly or nearly the same as another word or phrase. In simple words we can say that it is something that related to the object or thing.
The opposite side of synonyms is antonym having a opposite meaning of another word.
The words Masticate refers to as the grind, crush and chew the food and the teeth is the preparation for swallowing.
Moreover, the term Gnaw is as similar as the word Masticate that comes from Greek mastikhan.
Therefore, rest options like A, C and E are incorrect because they are not closely with each other. they have their separate meanings.
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