cap² /kap/ or caup /köp/ (Scot)

A wooden drinking bowl, with two handles

• 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
• oncers
• onces
• once upon a time
• onchocerciases
• onchocerciasis
• oncidium
• oncidiums
• on cloud nine
• onco-
• oncogen
• oncogene
• oncogenes