R-controlled vowel: 當母音後面跟著r，r會影響母音的發音
or, orb, for, nor, abhor, cork, fork, pork, stork, horde, ford, afford, cord, chord, discord, record (verb), lord, landlord, sword, snort, short, sort, port, report, export, import, deport, airport, passport, transport, sport, support, resort, contort, distort, extort, escort, scorch, porch, torch, torso, tort, born, morn, torn, thorn, horn, greenhorn, worn, sworn, scorn, corn, popcorn, unicorn, Capricorn, acorn, adorn, accord, absorb, forlorn, storm, norm, normal, dorm, dormitory, dormant, form, inform, conform, perform, platform, uniform, reform, transform, north, forth, forgo, format, formal, formidable, formula, formulate, forge, forage, fortress, forfeit, forward, fortune, fortify, fortitude, fort, forte, force, enforce, endorse, horse, hormone, corner, border, order, disorder, ornate, ordeal, organic, organ, organize, orchestrate, orchestra, orchid, orchard, ordinary, orbit, ornament, portray, portrait, portal, portable, portfolio, porcupine, porcelain, portion, proportion, portend, purport, important, enormous, gorgeous, gorge, retort, remorse, mortify, morbid, morph, mortgage, mortar, mortal, morsel, chortle, cordial, corpus, corporate, incorporate, corrugate, coordinate, cohort, accordion, sordid, vortex, tortoise, torrent, tornado, torture
* 例外： word, work, worth, worship, worm, worse, worst, worry, world, attorney 的 or 發音不像平常的 or， 要發音為 er [重音節 ɝ].
* unstressed syllable (非重音節)： favor, flavor, factor, candor, camphor, bachelor, razor, tailor, anchor, harbor, arbor, ardor, armor, author, error, terror, mentor, splendor, benefactor, scissors, senior, minor, color, honor, sponsor, horror, odor, motor, humor, tutor, junior, comfort, effort, stubborn, demeanor, ulterior, forget, forgive, exterior 的 or 非重音節，要發/ɚ/的音。
-er, -or (person or thing connected with)
Sometimes the -er suffix is written as -or (it is still pronounced /ɚ/)
actor, reactor, animator, agitator, ambassador, ancestor, calculator, navigator, validator, applicator, aggregator, evaluator, collaborator, attractor, detractor, distractor, abstractor, extractor, protractor, compactor, subcontractor, franchisor, narrator, translator, janitor, collator, locator, captor, grantor, guarantor, procrastinator, capacitor, radiator, liquidator, creator, perpetrator, savior, sailor, surveyor, purveyor, conveyor, author, auditor, arbitrator, editor, sector, elevator, escalator, emulator, educator, demonstrator, separator, generator, ventilator, respirator, decorator, director, selector, inventor, inheritor, investor, investigator, inspector, injector, authenticator, spectator, speculator, regulator, replicator, connector, projector, protector, collector, corrector, creditor, debtor, senator, sensor, vendor, legislator, elector, excavator, error, neighbor, predecessor, professor, suppressor, successor, assessor, possessor, executor, competitor, differentiator, interrogator, requestor, reflector, receptor, detector, defector, tormentor, oppressor, compressor, accelerator, aggressor, transgressor, realtor, releasor, mediator, administrator, illustrator, innovator, imitator, eliminator, visitor, dictator, liquor, irrigator, litigator, instigator, stimulator, simulator, incubator, integrator, insulator, indicator, vindicator, predictor, descriptor, exhibitor, contributor, distributor, inhibitor, incinerator, refrigerator, originator, initiator, solicitor, infiltrator, facilitator, manipulator, conspirator, licensor, advisor (adviser), survivor, chiropractor, proprietor, violator, hydrator, dehydrator, governor, modulator, operator, contractor, conservator, cooperator, interlocutor, depositor, pollinator, moderator, commentator, accommodator, prosecutor, prospector, processor, doctor, conqueror, comparator, voter, donor, motivator, exfoliator, negotiator, orator, coordinator, incorporator, cultivator, sculptor, conductor, constructor, destructor, instructor, trustor, disruptor, obfuscator, counselor, supervisor, duplicator, rejuvenator, juror, curator, accumulator, communicator, transferor, impersonator, exterminator, terminator, circulator