"Why" is an interjection, indicating surprise, perhaps anger, perhaps hesitation. "Wow" is almost always with an exclamation point and indicates admiration, being impressed. "why" is more old-fashioned.
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PonyFanI suppose this type of "why" can be replaced as "wow"No. The usage is actually different. Initial "why" when there is no question is an old-fashioned conversational device — I'd almost say "verbal tic" — that shows emotional involvement in what is said after the "why". It might be compared to expressions like "for heaven's sake" or "for goodness' sa