最も基本的な英単語100 - クジラ机ブログ

最も基本的な英単語を列挙したHorn Listと呼ばれるリストがあります。

100 Most Frequent English Words (Horn List)
http://www.englishcorner.vacau.com/vocabulary/hornlistfreq..

これによると以下の単語

他にも、この850語を覚えれば、通常の英語は表現できるという単語リスト

OGDEN's BASIC ENGLISH Word List - in His Order
http://ogden.basic-english.org/words.html

OPERATIONS - 100 words

come, get, give, go, keep, let, make, put, seem, take, be, do, have, say, see, send, may, will, about, across, after, against, among, at, before, between, by, down, from, in, off, on, over, through, to, under, up, with, as, for, of, till, than, 
a , the, all, any, every, little, much, no, other, some, such, that, this, I , he, you, who, and, because, but, or, if, though, while, how, when, where, why, again, ever, far, forward, here, near, now, out, still, then, there, together, well, 
almost, enough, even, not, only, quite, so, very, tomorrow, yesterday, north, south, east, west, please, yes .

THINGS - 400 General words

account, act, addition, adjustment, advertisement, agreement, air, amount,amusement, animal, answer, apparatus, approval, argument, art, attack, attempt, attention, attraction, authority, back, balance, base, behavior, belief, birth, bit, bite, blood, blow, body, brass, bread, breath, brother, building, burn, burst, business, butter, canvas, care, cause, chalk, chance, change, cloth, coal, color, comfort, committee, company, comparison, competition, condition, connection, control, cook, copper, copy, cork, cotton, cough, country, cover, crack, credit, crime, crush, cry ,current, curve, damage, danger, daughter, day, death, debt, decision, degree, design, desire, destruction, detail, development, digestion, direction, discovery, discussion, disease, disgust, distance, distribution, division, doubt, drink, driving, dust, earth, edge, education, effect, end, error, event, example, exchange, existence, expansion, experience, expert, fact, fall, family, father, fear, feeling, fiction, field, fight, fire, flame, flight, flower, fold, food, force, form, friend, front, fruit, glass, gold, government, grain, grass, grip, group, growth, guide, harbor, harmony, hate, hearing, heat, help, history, hole, hope, hour, humor, ice, idea, impulse, increase, industry, ink, insect, instrument, insurance, interest, invention, iron, jelly, join, journey, judge, jump, kick, kiss, knowledge, land, language, laugh, law, lead, learning, leather, letter, level, lift, light, limit, linen, liquid, list, look, loss, love, machine, man, manager, mark, market, mass, meal, measure, meat, meeting, memory, metal, middle, milk, mind, mine, minute, mist, money, month, morning ,mother, motion, mountain, move, music, name, nation, need, news, night, noise, note, number, observation, offer, oil, operation, opinion, order, organization, ornament, owner, page, pain, paint, paper, part, paste, payment, peace, person, place, plant, play, pleasure, point, poison, polish, porter, position, powder, power, price, print, process, produce, profit, property, prose, protest, pull, punishment, purpose, push, quality, question, rain, range, rate, ray, reaction, reading, reason, record, regret, relation, religion, representative, request, respect, rest, reward, rhythm, rice, river, road, roll, room, rub, rule, run, salt, sand, scale, science, sea, seat, secretary, selection, self, sense, servant, sex, shade, shake, shame, shock, side, sign, silk, silver, sister, size, sky, sleep, slip, slope, smash, smell, smile, smoke, sneeze, snow, soap, society, son, song, sort, sound, soup, space, stage, start, statement, steam, steel, step, stitch, stone, stop, story, stretch, structure, substance, sugar, suggestion, summer, support, surprise, swim, system, talk, taste, tax, teaching, tendency, test, theory, thing, thought, thunder, time, tin, top, touch, trade, transport, trick, trouble, turn, twist, unit, use, value, verse, vessel, view, voice, walk, war, wash, waste, water, wave, wax, way, weather, week, weight, wind, wine, winter, woman, wood, wool, word, work, wound, writing , year .

THINGS - 200 Picturable words - picture list

angle, ant, apple, arch, arm, army, baby, bag, ball, band, basin, basket, bath, bed, bee, bell, berry, bird, blade, board, boat, bone, book, boot, bottle, box, boy, brain, brake, branch, brick, bridge, brush, bucket, bulb, button, cake, camera, card, cart, carriage, cat, chain, cheese, chest, chin, church, circle, clock, cloud, coat, collar, comb, cord, cow, cup, curtain, cushion, dog, door, drain, drawer, dress, drop, ear, egg, engine, eye, face, farm, feather, finger, fish, flag, floor, fly, foot, fork, fowl, frame, garden, girl, glove, goat, gun, hair, hammer, hand, hat, head, heart, hook, horn, horse, hospital, house, island, jewel, kettle, key, knee, knife, knot, leaf, leg, library, line, lip, lock, map, match, monkey, moon, mouth, muscle, nail, neck, needle, nerve, net, nose, nut, office, orange, oven, parcel, pen, pencil, picture, pig, pin, pipe, plane, plate, plough/plow, pocket, pot, potato, prison, pump, rail, rat, receipt, ring, rod, roof, root, sail, school, scissors, screw, seed, sheep, shelf, ship, shirt, shoe, skin, skirt, snake, sock, spade, sponge, spoon, spring, square, stamp, star, station, stem, stick, stocking, stomach, store, street, sun, table, tail, thread, throat, thumb, ticket, toe, tongue, tooth, town, train, tray, tree, trousers, umbrella, wall, watch, wheel, whip, whistle, window, wing, wire, worm .

QUALITIES - 100 General

able, acid, angry, automatic, beautiful, black, boiling, bright, broken, brown, cheap, chemical, chief, clean, clear, common, complex, conscious, cut, deep, dependent, early, elastic, electric, equal, fat, fertile, first, fixed, flat, free, frequent, full, general, good, great, grey/gray, hanging, happy, hard, healthy, high, hollow, important, kind, like, living, long, male, married, material, medical, military, natural, necessary, new, normal, open, parallel, past, physical, political, poor, possible, present, private, probable, quick, quiet, ready, red, regular, responsible, right, round, same, second, separate, serious, sharp, smooth, sticky, stiff, straight, strong, sudden, sweet, tall, thick, tight, tired, true, violent, waiting, warm, wet, wide, wise, yellow, young .

QUALITIES - 50 Opposites

awake, bad, bent, bitter, blue, certain, cold, complete, cruel, dark, dead, dear, delicate, different, dirty, dry, false, feeble, female, foolish, future, green, ill, last, late, left, loose, loud, low, mixed, narrow, old, opposite, public, rough, sad, safe, secret, short, shut, simple, slow, small, soft, solid, special, strange, thin, white, wrong .

そして、2000語レベルを頻度順に並べたものがあって、このくらいは覚えたいと思いました。

General Service List (about 2000 Words)
http://www.englishcorner.vacau.com/vocabulary/first500.html
http://www.englishcorner.vacau.com/vocabulary/second500.html
http://www.englishcorner.vacau.com/vocabulary/third500.html
http://www.englishcorner.vacau.com/vocabulary/fourth500.html
（頻度順 1-2284） http://jbauman.com/gsl.html

参考) http://readingmonkey.blog45.fc2.com/blog-entry-413.html