I agree with Bruce, in noun form, they are synonyms. However, 'advocate' can also be a verb and then it would be used in a different way (as xarmania explains).
2013년 11월 12일
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Many sources write that they are synonyms, but I use the words somewhat differently. If I am a proponent of something then I may advocate for it. The word proponent expresses my stance (in favor) whereas advocate expresses what I do because of my stance.