Agony is a bit more general, it means distress, anguish (which indicate mostly mental sufferance) also: ----- ag·o·ny Function: noun Inflected Form(s): -es Etymology: Middle English agonie, from Middle French & Late Latin; Middle French agonie, from Late Latin agonia, from Greek ag nia contest, struggle, anguish, from ag n gathering, assembly at games, contest for a prize, from agein to lead, celebrate -- more at AGENT 1 a : intense pain of mind or spirit : extreme distress : ANGUISH <the agony of being found wanting and exposed to the disapproval of others -- Margaret Mead> b often capitalized : the sufferings of Jesus in the garden of Gethsemane <and being in an agony he prayed more earnestly -- Lk 22:44 (Authorized Version)> 2 a : intense pain of body : extreme torment : TORTURE <left arm twisted upward behind him ... Macaulay> 4 : a strong sudden and often uncontrollable display (as of joy or delight) : OUTBURST <my cousin ... in an agony of mirth -- Edith Wharton> synonym see DISTRESS -----------
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Marius HancuI think pain and agony are related to what the dying person feels by himself, but kill is more related to what is done to him/her by others, thus the reason for the above.I completely agree.