Goat - Vine's Expository Dictionary of New Testament Words
Goat[ 1,,G2056, eriphos ]
denotes a kid or goat," Matthew 25:32 (RV, marg., "kids"); Luke 15:29, "a kid;" some mss. have No. 2 here, indicating a sneer on the part of the elder son, that his father had never given him even a tiny kid.
[ 2,,G2055, eriphion ]
a diminutive of No. 1, is used in Matthew 25:33. In Matthew 25:32 eriphos is purely figurative; in Matthew 25:33, where the application is made, though metaphorically, the change to the diminutive is suggestive of the contempt which those so described bring upon themselves by their refusal to assist the needy.
[ 3,,G5131, tragos ]
denotes "a he-goat," Hebrews 9:12,13,19; Hebrews 10:4, the male prefiguring the strength by which Christ laid down His own life in expiatory sacrifice.