The yield (aka, yield to maturity, YTM) is the single rate that correctly prices the bond; it impounds the spot rate curve. For each coupon bond, there is a different implied yield. The PAR YIELD is the yield (YTM) for a bond that happens to price at par, and therefore is equal to this bond's coupon. So, the par yield (as a special case or particular YTM) is the coupon rate on a bond priced at par.
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