book agent(n = noun.person) - a book salesman;
is a kind of salesman

account book, activating agent, active agent, actor's agent, address book, adhesive agent, agent, agent bank, agent orange, agent provocateur, agricultural agent, alkalating agent, alpha-adrenergic blocking agent, anaesthetic agent, anesthetic agent, antianxiety agent, antifungal agent, antimycotic agent, antipsychotic agent, antispasmodic agent, antiviral agent, appointment book, ataractic agent, bank book, bell book, beta-adrenergic blocking agent, bill book, biological agent, black book, blanching agent, bleaching agent, blistering agent, block book, blocking agent, blue book, book, book bag, book binding, book collector, book fair, book jacket, book louse, book lover, book lung, book matches, book muslin, book of account, book of amos, book of baruch, book of common prayer, book of daniel, book of deuteronomy, book of ecclesiastes, book of esther, book of exodus, book of ezekiel, book of ezra, book of facts, book of genesis, book of habakkuk, book of haggai, book of hosea, book of instructions, book of isaiah, book of jeremiah, book of job, book of joel, book of jonah, book of joshua, book of judges, book of judith, book of knowledge, book of lamentations, book of leviticus, book of malachi, book of maps, book of micah, book of mormon, book of nahum, book of nehemiah, book of numbers, book of obadiah, book of proverbs, book of psalms, book of revelation, book of ruth, book of susanna, book of the prophet daniel, book of tobit, book of zachariah, book of zephaniah, book review, book scorpion, book seller, book token, book up, book value, booking agent, bridge agent, business agent, causal agent, chelating agent, chemical agent, claim agent, cleansing agent, closed book, coffee-table book, collection agent, coloring book, comic book, commonplace book, cookery book, county agent, customer agent, day book, dissolving agent, domesday book, doomsday book, double agent, drying agent, employment agent, espionage agent, estate agent, extension agent, fake book, fbi agent, federal agent, fixing agent, foreign agent, free agent, freight agent, general agent, good book, government agent, house agent, hypoglycaemic agent, hypoglycemic agent, immunizing agent, indian agent, infectious agent, infective agent, inquiry agent, instruction book, insurance agent, intelligence agent, internal revenue agent, land agent, law agent, lethal agent, literary agent, mill agent, minute book, mug book, mustard agent, narcotics agent, nerve agent, neuroleptic agent, neuromuscular blocking agent, order book, organophosphate nerve agent, oxidizing agent, paper-back book, paperback book, parliamentary agent, phone book, phrase book, picture book, pocket book, pop-up book, prayer book, press agent, psychotropic agent, purchasing agent, real estate agent, record book, reducing agent, reference book, road agent, rule book, sapiential book, secret agent, selling agent, service book, shipping agent, soft-cover book, softback book, solvating agent, source book, special agent, station agent, statute book, surface-active agent, talent agent, talking book, telephone book, theatrical agent, thrombolytic agent, ticket agent, ticket book, toll agent, trade book, transfer agent, travel agent, undercover agent, universal agent, wetting agent, white book, wisdom book, yellow book