Aborted entoloma: The gills are often descending slightly on the stem. They start off pale grayish but become pink.
Livid pinkgill: The gills are sinuate, yellowish at first but becoming pink with maturity.
Aborted entoloma: Often found with 'abortive' or misshapen mushrooms nearby.
Livid pinkgill: Does not typically have these abortive forms associated.