good turn(n = noun.act) turn - a favor for someone; "he did me a good turn"
is a kind of favor, favour

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.

a good deal, about turn, amp'8are turn, cape of good hope, cape of good hope province, common good, do good, for good, for good measure, good, good afternoon, good and, good authority, good book, good bye, good chance, good condition, good continuation, good day, good deal, good deed, good egg, good enough, good example, good faith, good fellow, good for, good for you, good form, good fortune, good friday, good guy, good health, good humor, good humored, good humour, good looking, good looks, good luck, good luck charm, good manners, good morning, good nature, good night, good now, good ol' boy, good old boy, good old days, good ole boy, good part, good person, good samaritan, good sense, good shape, good shepherd, good speller, good spirit, good story, good taste, good temper, good time, good times, good vibrations, good weather, good will, good word, have a good time, hold good, ill turn, in good order, in good spirits, in good taste, in good time, in turn, kick turn, kiss good bye, make good, no good, sea turn, stem turn, three-point turn, toss and turn, trade good, turn, turn a blind eye, turn a loss, turn a nice dime, turn a nice dollar, turn a nice penny, turn a profit, turn a trick, turn about, turn around, turn aside, turn away, turn away from, turn back, turn down, turn in, turn indicator, turn inside out, turn into, turn of events, turn of expression, turn of phrase, turn of the century, turn off, turn on, turn on a dime, turn one's stomach, turn out, turn over, turn over a new leaf, turn red, turn signal, turn tail, turn the corner, turn the other cheek, turn the tables, turn the tide, turn the trick, turn thumbs down, turn to, turn turtle, turn up, turn up the heat, turn up the pressure, turn upside down