愛書[aisho] great love of books
愛読書[aidokusho] favourite book
悪書[akusho] harmful book
案内書[annaisho] guidebook
移動図書館[idoutoshokan] mobile library

遺言書[yuigonsho] testament
遺書[isho] note left by dead person
医書[isho] medical book
一つ書き[hitotsugaki] an item
一書[issho] one letter

購読[koudoku] paid subscription (e.g. magazine)
購読料[koudokuryou] subscription charge
購入[kounyuu] purchase
購入者[kounyuusha] purchaser
購入注文[kounyuuchuumon] purchase order

購買[koubai] procurement
購買力[koubairyoku] buying power
直接購入[chokusetsukounyuu] direct purchase
購う[aganau] to compensate
購入先[kounyuusaki] retailer