buy
verb
°To obtain (something) in exchange for money or goods.
°(informal) to accept as true; to believe.
synonyms: purchase, acquire, shop, accept more» , believe, swallow, take on
sell
verb
°To agree to transfer goods or provide services in exchange for money.
"I'll sell you all three for a hundred dollars."
°To be sold.
"This old stock will never sell."
noun
°An act of selling.
"This is going to be a tough sell."
°An easy task.
"1922: What a sell for Lena! - Katherine Mansfield, The Doll's House (Selected Stories, Oxford World's Classics paperback 2002, 354)"
trade
adjective
°relating to or used in or intended for trade or commerce;.
"a trade fair; trade journals; trade goods."
noun
°The commercial buying and selling of goods and services.
°International buying and selling of goods and services.
verb
°To engage in trade.
°To be traded at a certain price or under certain conditions.
synonyms: commerce, business, craft, deal more» , barter, patronage, trade wind, deal, exchange, swap, switch, do business, make a deal