Words beginning with 오
- 오곡–five grains; all grains
- 오늘날–today; these days
- 오대양–five oceans
- 오동–paulownia; wutong tree
- 오동나무–paulownia; wutong tree
- 오디–mulberry
- 오래–long
- 오래도록–long
- 오래되다–old; ancient
- 오랜–long
- 오류–fallacy; mistake; miscalculation; error
- 오르다–go up; get on; climb; reach; assume; get to; take; make it; start; be headed; go on; gain; become fatter; be put; be placed; be on; be the center of; be run; rise; increase; get intensified; get a boost; get better; get stronger; be infected; be possessed; be bedeviled; be stained with; be smudged with
- 오르막–ascent; uphill; moving into high gear
- 오르막길–ascent; uphill; moving into high gear
- 오른–right
- 오른발–right foot
- 오른손–right hand
- 오른손잡이–right-hander
- 오른쪽–right
- 오른팔–right arm; right-hand man
- 오리발–webbed feet; webbed toes; duck toes; webbed fingers; pretence
- 오빠–elder brother
- 오세아니아–Oceania
- 오솔길–trail; path
- 오스트레일리아–Australia
- 오아시스–oasis
- 오염–pollution; contamination; corruption
- 오염되다–be polluted; be contaminated; be corrupted
- 오월–May
- 오이–cucumber
- 오존–ozone
- 오줌–urine
- 오직–just; only; solely
- 오촌–one's cousin's child; one's father's cousin; one's mother's cousin
- 오히려–on the contrary; rather; preferably; in lieu of