The name of the letter O, used in English in exclamations, direct address, and poetic apostrophe.
OğlanA boy or young male servant, especially a page in the Ottoman palace or military system.
O'KaneAn Irish surname, an anglicized form of Ó Catháin.
O'odhamAn Indigenous Uto-Aztecan people of southern Arizona and northern Sonora, and the language they speak.
OahuThe third-largest island in Hawaii, home to Honolulu and the majority of the state’s population.
OakA large tree of the beech family with lobed leaves and acorns, valued for its hard wood.
OarA long pole with a flat blade used to row or steer a boat.
OasisA fertile place in a desert or other arid region where water is available.
OatA cereal plant cultivated for its edible grains, commonly used as food for humans and livestock.
OathA solemn promise, often invoking a divine witness, regarding one's future action or behavior.
Oath of OfficeA formal promise made by a person entering a public position to fulfill its duties faithfully.
OathboundBound or obligated by an oath or promise.
OathbreakerA person who breaks a sworn promise or oath.
OathkeeperA person who keeps or honors an oath.
OathswornBound or pledged by a solemn oath, especially to a person, cause, or code.
OaxacaA state in southern Mexico, and its capital city, known for its Indigenous cultures and rich regional history.
Ob-UgricA linguistic grouping comprising the Khanty and Mansi languages of western Siberia.
ObaA traditional ruler or king, especially among the Yoruba and neighboring peoples of West Africa.
ObadiahA biblical Hebrew name meaning “servant of Yahweh,” borne by several figures in the Hebrew Bible.
ObakeA Japanese ghost, spirit, or shapeshifting monster, especially one that has transformed from its original form.