Words Starting with “O”

Plural form of oak; large trees or shrubs of the genus Quercus, noted for their hard wood and lobed leaves.

A person who raises an objection or expresses formal opposition to something.

The quality of being excessively obedient, attentive, or servile to an annoying degree.

The difference between a measured value of a quantity and its true value, caused by factors related to the observer or the measuring instrument.

Relating to or occurring in the ocean; or, figuratively, vast and immense in scale.

Idle, inactive, or unoccupied; refraining from work or exertion.

Strange or peculiar items, features, or behaviors that deviate from what is considered normal or expected.

Available to be summoned for work or duty, especially during hours outside of a regular schedule.

Available or provided only if specifically asked for by someone.

The cardinal number equal to 1,000,000,000 (one thousand million, or 10^9).

A specific duration of time equivalent to 106 minutes or 6,360 seconds.

An algebraic math problem asking for the remaining root of a quadratic equation given one known solution.

Not closed, locked, or fastened; allowing access, passage, or view.

A device or tool used for opening containers, such as cans, bottles, or letters.

An article in a publication such as a newspaper or magazine that expresses the personal views, beliefs, or commentary of the writer rather than purely objective news reporting.

A person or entity that competes against another in a contest, game, or argument; a rival or adversary.

Situated on the other or further side when compared to something else; facing something, especially talking about positions.

An experience of sight that is deceptive or misleading, causing the viewer to perceive something that differs from objective reality.