good day(n = noun.communication) adieu, adios, arrivederci, au revoir, auf wiedersehen, bye, bye-bye, cheerio, good-by, good-bye, goodby, goodbye, sayonara, so long - a farewell remark; "they said their good-byes"
is a kind of farewell, word of farewell

N  courtesy, respect, good manners, good behavior, good breeding, manners, politeness, bienseance, urbanity, comity, gentility, breeding, polish, presence, civility, civilization, amenity, suavity, good temper, good humor, amiability, easy temper, complacency, soft tongue, mansuetude, condescension, affability, complaisance, pr_evenance, amability, gallantry, pink of politeness, pink of courtesy, compliment, fair words, soft words, sweet words, honeyed phrases, ceremonial salutation, reception, presentation, introduction, accueil, greeting, recognition, welcome, abord, respects, devoir, regards, remembrances, kind regards, kind remembrances, love, best love, duty, empty encomium, flattering remark, hollow commendation, salaams, obeisance, bow, courtesy, curtsy, scrape, salaam, kotow, kowtow, bowing and scraping, kneeling, genuflection, obsequiousness, capping, shaking hands grip of the hand, embrace, hug, squeeze, accolade, loving cup, vin d'honneur, pledge, love token, kiss, buss, salute, mark of recognition, nod, nods and becks and wreathed smiles, valediction, condolence, courteous, polite, civil, mannerly, urbane, well-behaved, well- mannered, well-bred, well-brought up, good-mannered, polished, civilized, cultivated, refined, gentlemanlike, gallant, on one's good behavior, fine spoken, fair spoken, soft-spoken, honey-mouthed, honey- tongued, oily, bland, obliging, conciliatory, complaisant, complacent, obsequious, ingratiating, winning, gentle, mild, good-humored, cordial, gracious, affable, familiar, neighborly, diplomatic, tactful, politic, artful, courteously, with a good grace, with open arms, with outstretched arms, a bras ouverts, suaviter in modo, in good humor, Int, hail!, welcome!, well met!, ave!, all hail!, good day, good morrow!, Godspeed!, pax vobiscum!, may your shadow never be less!, Tien de plus estimable que la ceremonie, the very pink of courtesy.

a good deal, admission day, all day long, all fools' day, all saints' day, all souls' day, american indian day, annunciation day, april fools' day, arbor day, armed forces day, armistice day, ascension day, bastille day, bissextile day, boxing day, break of day, break of the day, by the day, calendar day, call it a day, candlemas day, cape of good hope, cape of good hope province, childermas day, christian holy day, christmas day, citizenship day, civil day, clarence day, clarence shepard day jr., class day, columbus day, commencement day, common good, commonwealth day, day, day after day, day bed, day blindness, day boarder, day book, day by day, day camp, day care, day care center, day game, day in and day out, day in day out, day jessamine, day laborer, day labourer, day lily, day nursery, day of atonement, day of judgement, day of judgment, day of reckoning, day of remembrance, day of rest, day of the month, day of the week, day off, day return, day school, day shift, day watch, decoration day, degree day, discovery day, do good, dominion day, each day, easter day, election day, ember day, empire day, every day, fast day, father's day, feast day, fete day, field day, flag day, for good, for good measure, forever and a day, future day, gain the day, good, good afternoon, good and, good authority, good book, good bye, good chance, good condition, good continuation, 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 turn, good vibrations, good weather, good will, good word, groundhog day, guy fawkes day, have a good time, high holy day, hold good, holy day, holy day of obligation, holy innocents' day, in good order, in good spirits, in good taste, in good time, inauguration day, independence day, innocents' day, jewish holy day, judgement day, judgment day, kiss good bye, labor day, lady day, lammas day, last day, leap day, lord's day, lunar day, major fast day, make good, market day, martin luther king day, may day, mean solar day, memorial day, michaelmas day, midsummer day, midsummer's day, minor fast day, mother's day, naked as the day one was born, naked as the day you were born, name day, natal day, new year's day, night and day, no good, order of the day, pan american day, pancake day, patriot's day, patriots' day, pioneers' day, polling day, poppy day, present day, presidents' day, quarter day, rag day, rainy day, red-letter day, remembrance day, rest day, robert e lee day, rogation day, saint patrick's day, saint valentine's day, saint's day, school day, seize the day, sidereal day, six day war, solar day, speech day, st john's day, st martin's day, st patrick's day, st valentine's day, tag day, term day, texas independence day, thanksgiving day, three kings' day, time of day, trade good, transfiguration day, twelfth day, united nations day, unlucky day, v-e day, v-j day, valentine day, valentine's day, veterans day, veterans' day, victoria day, victory day, washing day, wedding day, work day, working day