ONE WORD SUBSTITUTION ‘O’

List of One Word Substitution

One words substitution asked in various exam specially, in SSC exams. These previous years one words substitution help you in cracking exam.

• Oasis– a fertile tract in a desert (where the water table approaches the surface)
• Obeisance– the act of obeying
• Obese– very fat, in a way that is not healthy
• Obituary– a notice of someone’s death (with his life and achievements)
• Objective– not influenced by personal feelings/ opinions
• Oblation– a thing presented or offered to god or a god.
• Obligatory– legally binding
• Obligingly– very willing to help
• Oblique– not expressed/ done in a direct way // sloping at an angle (line) // an angle that is not of 90°
• Oblivion– the state of being disregarded or forgotten
• Oblivious– not aware of something
• Obloquy– abusively detractive language sharp criticism vituperation
• Obscure– not clearly understood or expressed
• Observation– the act of watching carefully, for a period of time
• Observatory– a building designed and equipped to observe astronomical phenomena
• Obsession– the state in which a person’s mind is completely filled with the thoughts of one particular thing or a person in a way that is not normal
• Obsidian– a type of dark rock that looks like glass and comes from volcanoes
• Obsolescent– becoming old-fashioned and no longer useful
• Obsolete– no longer used because something new has been invented
• Obstetrician– a doctor who is trained in the branch of medicine concerned with the birth of children
• Obstetrics– concerned with the birth of children
• Obtuse– blunt/stupid
• Obviate– to make unnecessary get rid of
• Obvious– easily perceived by the senses or grasped by the mind
• Occidental– connected with western part of the world (Europe and America)
• Octagon– a flat shape with eight straight sides and eight angles
• Octogenarian– a person between 80 and 89 years of age
• Octopus– eight armed sea creature
• Oculist– a doctor who examines and treats people’s eyes
• Ode– a poem that speaks to a person/thing/celebrates a special event
• Odious– repulsive hateful
• Oenology– study of wines.
• Oenomania– obsession for wine
• Oenophile– a lover of wines.  
• Offbeat– not coinciding with the beat.
• Offence– a crime less serious than a felony
• Offend– cause to feel resentment or indignation
• Offender– a person who commits a crime
• Offensive– unpleasant or disgusting especially to the senses
• Offer– to say that you are willing to do something
• Ogre– (folklore) a giant who likes to eat human beings
• Oleograph– a print textured to resemble an oil painting
• Oligarchy– a form of government in which only a small group of people hold all the power
• Ombudsman– an official whose job is to examine and report on complaints made by ordinary people about companies, the government, etc.
• Ominously– in a manner that suggests that something bad is going to happen in the future
• Omnipotent– having total power // able to do anything
• Omnipresent– present everywhere
• Omniscient– knowing everything
• Omnivore– an animal that feeds on both animal and vegetable substances
• Omnivorous– eating all types of food (plants and meat)
• Oncology– study and treatment of tumours
• Opaque– not clear enough to see through/ allow light through
• Opener– the first action in an event, a game, etc.
• Operation– the process of cutting open a part of a person’s body in order to remove or repair a damaged part
• Ophiology– study of snakes
• Ophiophobia– fear of snakes
• Ophthalmologist– a doctor who studies and treats the diseases of the eye
• Opinionated– having very strong opinions that you are not willing to change
• Opportune– suitable or at a time that is suitable or advantageous especially for a particular purpose
• Opprobrium– public disgrace arising from shameful conduct
• Optician– a person whose job is to examine people’s eyes and to recommend and sell glasses
• Optimism– a feeling that good things will happen and that something will be successful
• Optimist– a person who always expects good things to happen or things to be successful
• Optique– relating to the eye/vision
• Opulent– rich and superior in quality
• Opulent– decorated using expensive materials
• Opus– a musical work that has been created
• Oration– a formal speech made on a public occasion, especially as part of a ceremony
• Orator– a person who is good at public speaking/ who makes formal speeches
• Oratory– skill in public speaking
• Orbit– a curved path followed by a planet or an object as it moves around another planet, star, moon, etc.
• Orchard– a piece of land, in which fruit trees are grown
• Orchestra– seating on the main floor in a theater
• Orchitis– inflammation (swelling) of one or both testes
• Order– the arrangement or disposition of people or things in relation to each other according to a particular sequence, pattern, or method
• Ordnance– Depots where military supplies and materials are stored
• Oriental– characteristics of countries of Asia
• Original– existing at the beginning of a particular period, process/activity // new and interesting in a way that is different from anything that has existed before
• Ornate– covered with a lot of decoration
• Ornithologist– a person who studies birds
• Ornithology– the scientific study of birds
• Orology– the science of mountains
• Orophobia– fear of victory/happiness/wealth.
• Orphan– a child whose parents are dead
• Orphanage– a public institution for the care of orphans
• Orthodontics– the treatment of problems concerning the position of the teeth and jaws
• Orthography– the system of spellings in a language
• Orthopaedic– the doctor concerned with injuries and diseases of the bones/ muscles
• Orthopaedics– a the branch of medicine concerned with injuries and diseases of the bones/muscles
• Orthopathy– a alternative medicine philosophy advocating a vegetarian, raw food diet with periods of intermittent fasting
• Oscillate– to keep moving from one position to another and back again
• Ostensible– seeming appearing as such professed
• Osteopathy– the treatment of some diseases and physical problems by pressing and moving the bones and muscles
• Ostler– a person who looks after horses at an inn
• Ostracise– to banish or turn out of society and fellowship
• Ostracism– shut out from society refuse to meet talk
• Otologist– a specialist in diseases of the ear
• Oubliette– a dungeon with the only entrance or exit being a trap door in the ceiling
• Oust– remove from a position or office
• Out– Law a person who has done something illegal and is hiding to avoid being caught
• Outcast– a person who is rejected (from society/home)
• Outdated– no longer useful because of being old-fashioned
• Outpost– a small military camp away from the main army, used for watching an enemy’s movements
• Outrider– a person who rides a motorcycle/ a horse in front of or beside the vehicle of an important person in order to give protection
• Ovation– enthusiastic recognition (especially one accompanied by loud applause)
• Overcome– get on top of
• Over-Draft– a draft in excess of the credit balance
• Overhaul– to examine every part of a machine, system, etc. and make any necessary changes/repairs
• Overlook– to fail to see/notice something
• Overture– orchestral music played at the beginning of an opera or oratorio
• Overweight– too heavy and fat
• Ovine– connected with sheep
• Oxymoron– a phrase that combines two words that seem to be the opposite of each other

One word substitution ‘N’