O
objective, observe, obtain, obvious, occasion, occupation,
occur, opinion, ordinary, organ, origin, original, oppose,
opposite, opportunity, operate, operation, otherwise, ought to,
outside, outer, oven, overcoat, overcome, own
P
package, pain, painful, pale, participate, particularly,
passive, patient, patience, pattern, peace, perfect, perform,
permanent, press, pressure, persuade, pet, phrase, philosopher,
physical, picnic, pigeon, pile, pin, pioneer, pipe, plastic,
pleasure, plentiful, plenty, poet, poison, policy, polite, pollute,
pollution, pop, popular, population, possibility, positive,
postpone, poverty, powerful, practical, practice, practice, praise,
pray, predict, president, previous, primary, private, prize,
probability, probable, probably, process, product, production,
program, progress, progressive, project, promise, promote,
pronunciation, proper, proportion, proposal, propose, protect,
prove, proof, provide, public, publish, punish, pupil, purpose
Q
qualify, quality, quarter, quit
R
range, railroad, rapid, rate, ray, ready, reasonable, recall,
recognition, recognize, record, recommend, recover, reduce, refer,
reference, refrigerator, regardless, regret, region, register,
relate, relation, relative, relax, release, reliable, remark,
remarkable, remind, replace, reply, rescue, resemble, resist,
resistance, resource, respect, respective, represent, responsible,
retain, reveal, review, revolution, rid, ride, rise, rock, roll,
root, round, ruin
S
sack, salary, sale, salesman, satellite, satisfactory, saving,
scholar, scholarship, score, screen, seal, secondary, secret,
security, seldom, select, selfish, sense, sensible, separate,
series, service, severe, sex, shade, shape, share, sharp, shelter,
shift, shoot, shock, shortage, sickness, side by side, sign,
shrink, similar, simple, simplicity, simply, sink, situation, size,
skillful, slam, slip, smell, social, solve, somehow, sort, source,
spare, speed, spin, spider, split, spite, spot, spread, stable,
stage, state, statement, station, steadily, steam, step, stimulate,
store, straight, strange, struggle, subject, style, sudden, suffer,
sum, supply, support, suppose, surround, surroundings, survey,
system