post card(n = noun.communication) mailing-card, postal card, postcard - a card for sending messages by post without an envelope; Array
is a kind of card
has particulars: lettercard, picture postcard

N  correspondence, letter, epistle, note, billet, post card, missive, circular, favor, billet-doux, chit, chitty, letter card, picture post card, postal, card, despatch, dispatch, bulletin, these presents, rescript, rescription, post, epistolary, furor scribendi.

bank card, baseball card, binding post, birthday card, boarding card, borrower's card, business card, c. w. post, calling card, card, card carrier, card carrying, card catalog, card catalogue, card game, card index, card player, card shark, card sharp, card sharper, card table, card trick, cash card, charge card, charles william post, christmas card, circuit card, command post, compass card, corner post, cossack post, court card, credit card, deaf as a post, debit card, donor card, drawing card, easter card, emily post, emily price post, ex post facto, face card, filing card, flash card, from pillar to post, gaming card, get-well card, goal post, green card, greeting card, hinging post, hitching post, hole card, hollerith card, id card, identity card, king post, library card, local post office, mass card, membership card, meteorological observation post, military post, missionary post, newel post, observation post, parcel post, phone card, picture card, playing card, post, post and lintel, post chaise, post doc, post exchange, post hoc, post hoc ergo propter hoc, post hole, post horn, post horse, post house, post meridiem, post note, post oak, post office, post road, postal card, punch card, punched card, queen post, ration card, registered post, report card, sea card, show card, shutting post, smart card, starting post, swinging post, sympathy card, tarot card, telegraph post, totem post, trading card, trading post, trump card, union card, united states post office, us post office, visiting card, whipping post, wild card, wiley post, winning post