THESAURUS
good turn
act of grace, act of kindness, benefaction, benefit, benevolence, benignity, blessing, courtesy, favor, good deed, good offices, grace, kind deed, kind offices, kindly act, kindness, labor of love, mercy, mitzvah, obligation, office, service, turn
ROGET THESAURUS
good turn
Good
N
good, benefit, advantage, improvement, greatest good, supreme good, interest, service, behoof, behalf, weal, main chance, summum bonum, common weal, consummation devoutly to be wished, gain, boot, profit, harvest, boon,
good turn, blessing, world of good, piece of good luck, piece of good fortune, nuts, prize, windfall, godsend, waif, treasure-trove, good fortune, happiness, goodness, utility, remedy, pleasure giving, commendable, useful, good, beneficial, well, aright, satisfactorily, favorably, not amis, all for the best, to one's advantage, in one's favor, in one's interest, so far so good, magnum bonum.