HackerVoca

: unyielding, stubborn, inflexible, headstrong,dogged
obstruct : block, stop, bar, hinder, barricade, impede / / verb [transitive]
to prevent something from happening in the normal way, or make it happen more
slowly: Storms at sea impeded our progress.

obtain* : get, acquire, procure, secure, gain, achieve, attain,
earn, win
obvious : plain, manifest, evident, clear, apparent, distinct
occult : mysterious, secret, unknown, mystical
occupation : calling, trade, business, profession, vocation,
pursuit
occupy : capture, seize
occur : happen, befall
occurrence : event, incident, affair
odd : unusual, strange, weird, queer, quaint, eccentric1 / adjective

1 behaving or appearing in a way that is unusual and different from most people: students dressed in eccentric clothing | an eccentric old woman

2 technical eccentric circles do not have the same centre point

concentric
eccentrically / adverb ,bizarre