answer choice 4: “to distinguish between word meanings” because a thesaurus is the same as a dictionary, accept it haves the meanings of words so, you’d use a thesaurus if you had no idea what a word meant and needed to find what i meant go there and find synonyms. you are looking more than just a word, ex; augment; to make or became greater as in size; synonyms; quantity,strength, increase.
hope this helped :) <3.