| Word | Meaning |
| Namesake | Somebody or something with the same name as somebody or something else |
| Narcotic | Medicine which induces sleep. |
| Native | One whose parents are domiciled. |
| Naughty | A badly behaved child. |
| Neologism | New word coined by an author. |
| Neophyte | One who is a newcomer |
| Notary | Person publically authorized to draw up or attest contracts etc |
| Notorious | A person with an evil reputation |
| Novice | One who is new to a trade or profession |
| Numismatics | Science of coins or medals |
| Nutritive | Article of food rich in nutrition. |
| Oasis | Fertile spot in desert. |
| Obesity | Having lot of fat in one’s body. |
| Obituary | A notice of death in a newspaper. |
| Obsolete | A thing no longer in use |
| Oceanography | Study of ocean |
| Odontology | Study of Teeth |
| Oligarchy | A Government by the few |
| Omnipotent | All-powerful; possessing complete power and authority |
| Omnipresent | One who is present everywhere |
| Omniscient | A person who knows everything |
| Omnivorous | An animal or a human being that eats any kind of food |
| Opaque | That through which light cannot pass |
| Ophthalmology | Study of Eye |
| Optic | Science of sight and light. |
| Optics | Study of light |
| Optimist | One who looks at the bright side of things; somebody positive |
| Orator | One who makes an eloquent public speech. |
| Ordnance | A factory where military materials are produced. |
| Oriental | A person of Asian, especially East Asian, descent. |
| Ornithology | A study of birds |
| Orography | Study of mountain |
| Orphan | A person without father and mother. |
| Orphanage | A place where orphans live |
| Orthodox | One who believes in traditional values |
| Orthography | Study of correct spelling of words |
| Ostracize | To expel from society |
| Ostrich | A large bird reputed to bury its head in sand when pursued. |
| Outcast | Cast out as useless. |
এই লেকচারের পরের পেইজে যেতে নিচের 
…. তে ক্লিক কর।