O字母开头的单词或词组(第11页)：

• owner
• ownership
• ox
• obey
• oxygen
• object
• observe
• obtain
• occasion
• occasional
• occupy
• occur
• ocean
• October
• odd
• of
• off
• oh
• offence
• offer
• office
• official
• officer
• oil
• operate
• often
• okay
• on
• old
• oneself
• only
• once
• one
• open
• opening
• opera
• opinion
• opportunity
• opposite
• opposition
• opt
• optical
• oak
• oasis