売買【ばいばい】
trade, buying and selling, trafficking (e.g. of humans, arms, drugs), dealing
買収【ばいしゅう】
acquisition (esp. corporate), buy-out, takeover, purchase, bribery, buying off, corruption
買い物【かいもの】
shopping, purchased goods
買う【かう】
to buy, to purchase, to value (highly), to think highly of, to have a high opinion of, to appreciate, to recognize, to incur (someone's anger, displeasure, etc.), to elicit (e.g. sneers), to invite (e.g. scorn), to evoke, to arouse, to win (someone's favour), to accept, to take on, to take up, to pay for (a prostitute, geisha, etc.)
買い占め【かいしめ】
buying up of goods, cornering (market)
買い手【かいて】
buyer
購買【こうばい】
procurement, purchase, buying, school store, co-op, school canteen, tuck shop
買い占める【かいしめる】
to buy up
買い入れる【かいいれる】
to purchase, to buy in
仲買【なかがい】
brokerage