SYN: Gain, success, superiority, help, assistance, benefit, good, avail, interest, utility, service, profit, acquisition.
ANT: Loss, disappointment, defeat, frustration, inferiority, obstacle, obstruction, difficulty, dilemma, disadvantage, drawback.
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KEY: Advent.
SYN: Approach, arrival, accession, coming.
ANT: Departure, exit, exodus, retirement, relinquishment, quittance.
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KEY: Adventitious.
SYN: Extrinsic, redundant, superfluous, adscititious irregular, casual, imported.
ANT: Regular, proper, pertinent, essential, appropriate, necessary, Intrinsic.