一口商い[hitokuchiakinai] an immediate definite deal
一文商い[ichimonakinai] (a) penny store
卸し商[oroshishou] wholesaler
華商[kashou] Chinese merchants abroad
画商[gashou] picture dealer

会商[kaishou] negotiation
海商法[kaishouhou] maritime law
関連商品[kanrenshouhin] related product
客商売[kyakushoubai] hotel
巨商[kyoshou] wealthy merchant

亜科[aka] subfamily
医科[ika] medical science
医科大学[ikadaigaku] medical school
家庭科[kateika] home economics
科名[kamei] family name

科する[kasuru] to inflict
科学[kagaku] science
科学院[kagakuin] science institute
科学技術[kagakugijutsu] science and technology