B2 Level English Words

objective noun obligation noun observation noun observe verb observer noun obstacle noun obtain verb occasionally adverb occupation noun occupy verb offence noun offend verb offender noun offensive adjective official noun ongoing adjective opening noun openly adverb opera noun operate verb operator noun opponent noun oppose verb opposed adjective opposition noun optimistic adjective orchestra noun organ noun organic adjective origin noun otherwise adverb outcome noun outer adjective outfit noun outline noun outline verb output noun outstanding adjective overall adjective overall adverb overcome verb overnight adverb overseas adjective overseas adverb owe verb ownership noun oxygen noun pace noun pace verb package verb packet noun palm noun panel noun panic noun parade noun parallel adjective parallel noun parliament noun part-time adjective participant noun