monoglot /monˈō-glot/

1. Able to speak only one language, monolingual
2. Using or written in only one language

1. A person who speaks only one language
2. A book written in only one language

• 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
• oncers
• onces
• once upon a time
• onchocerciases