1.마치 is a adverb,but 처럼 is a proposition 2.when we have both 마치&처럼 in one sentence, we can delete 마치 but not 처럼, I mean the sentence makes sense(but the meaning gets lighter) & correct as well. ex)그는 마치 나비처럼 날았다 He flew like a butterfly. 그는 나비처럼 날았다(o) 그는 마치 나비 날았다.(x) 3.마치 also corresponds with같이(exactly same meaning &function with 같이,proposition,replaceable with처럼) 그는 마치 나비같이 날았다.(o) but 같이 can have lots of meanings and versions(i mean word classes,so 같이 can be a verb,adverb,proposition.. based on grammatical applications).However,처럼 can be only a proposition
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