Letter: b
- backward motion, advance, ascent, backing, backsliding, career, climbing, course, current, descent, drift, flight, flow, flux, forward motion, lapse

- backward step, backsliding, lapse, re-entry, reaction, recession, recidivism, reflux, regress, relapse, retroflexion, retrogression, return, roll-back, setback, throwback

- backward, Olympian, a priori, about, afraid, aft, after, after time, aftermost, again, against the grain, ago, aloof, anticlockwise, apathetic, around

- backwardness, antipathy, arrested development, aversion, coldness, conservatism, constraint, cretinism, detachment, disagreement, discretion, disinclination, disobedience, dissent, distance, distaste

- backwards and forwards, back and forth, off and on, round and round, see-saw, thoroughly, to and fro, up and down, vice versa

- backwards, against the grain, astern, away, back, backward, counter-clockwise, fro, head over heels, inside, inside out, introverted, inversely, inverted, over, rearward

- backwash, back stream, backlash, backwater, backwoods, boon docks, bush, clout, condensation trail, contrail, counterflow, eddy, exhaust, force, gulf, hinterland

- backwater, abjure, arrest, back, back away, back down, back off, back out, back stream, back up, back-pedal, backtrack, backwash, backwoods, boon docks, brake

- backwood, back, back country, back of beyond, backwoods, outback, sylvan, virgin, waste, wild, woodland

- backwoods, back, back country, back of beyond, back-country, backwash, backwater, backwood, boon docks, borderland, brush, bush, bush country, forests, frontier, hinterland

- backwoodsman, briar-hopper, brush ape, bumpkin, bushman, clam digger, cracker, desert rat, forester, frontiersman, mountain man, mountaineer, piny, provincial, red neck, ridge runner

- bacon, butt, chitterlings, cracklings, fat back, gammon, ham, ham steak, lard, picnic ham, pig, pork, salt pork, side of bacon, small ham, suckling pig

- bacon-lettuce-tomato sandwich, grinder, hamburger, hot dog, sandwich

- bacteria, aerobic bacteria, amoeba, anaerobe, anaerobic bacteria, animalcule, bacillus, bacterium, bug, coccus, colon bacillus, diatom, disease-producing micro-organism, dyad, filterable virus, flagellate

- bacterial disease, abnormality, affection, affliction, ailment, allergy, atrophy, birth defect, blight, cardiovascular disease, complaint, complication, condition, defect, deficiency disease, deformity

- bactericide, antiseptic, disinfectant, fumigant, germicide, pesticide

- bacteriologist, biologist, botanist, naturalist, zoologist

- bacteriology, anatomy, biochemistry, biological science, biology, biometrics, biometry, bionics, biophysics, botany, cell physiology, cybernetics, cytology, ecology, embryology, enzymology

- bacterium, amoeba, anaerobe, bacillus, bacteria, bug, coccus, fungus, germ, micro-organism, microbe, mould, moulder, mouldy, pathogen, spirochaete

- bad blood, acrimony, animosity, animus, antagonism, antipathy, bad temper, bad will, bitter feeling, bitterness, blighting glance, clashing, collision, competition, conflict, contrariety

- bad books, aversion, disfavour, disinclination, dislike, displeasure, dissatisfaction, distaste, favour, indisposition

- bad boy, buffoon, bugger, cutup, devil, elf, hood, hoodlum, hooligan, imp, joker, knave, little devil, little monkey, little rascal, minx

- bad breath, bad smell, body odour, foetidness, foul breath, foul odour, halitosis, miasma, noxious stench, offensive odour, reek, reeking, rotten smell, stench, stench of decay, stink

- bad case, claptrap, fallacy, moonshine, solecism, sophism, sophistry, weak point

- bad character, bad name, bad odour, bad report, bad reputation, bad repute, disapprobation, discredit, disesteem, disfavour, dishonour, evil repute, ill fame, ill repute, ill-favour, poor reputation

- bad check, counterfeit, forgery, kite, queer

- bad condition, adjustment, form, order, repair, shape, trim

- bad copy, camouflage, contrast, difference, disguise, disparity, dissemblance, divergence, diversity, make-up

- bad debt, accounts payable, accounts receivable, amount due, bad debts, bill, bills, borrowing, charges, chits, debt, default, defection, delinquency, dishonour, dishonouring

- bad debts, bad debt, bill, borrowing, charge, chit, due, dues, indebtedness, liability, maturity, national debt, obligation, pledge, score
