babouche, babuche or baboosh /bə-booshˈ/

An Oriental heelless slipper

• on behalf of
• on bended knee
• on board
• on-board
• onboard
• ONC
• on call
• on camera
• once
• once-accented
• once again
• once and again
• once and for all
• once bitten, twice shy
• once-errand
• once for all
• once-for-all
• once in a blue moon
• once in a way
• once in a while
• once more
• once or twice
• once-over
• once-overs
• oncer