- -arium
- -ariums
- Arius
- Arizona
- Arizona College of the Bible
- Arizona College of the Bible
- Arizona State University
- Arizona Western College
- Arjuna
- ark
- Arkansas
- Arkansas Baptist College
- Arkansas Baptist College
- Arkansas College
- Arkansas River
- Arkansas State University
- run–on sentence
- run–through
- run–up
- rupee
- rupees
- Rupert
- Rupert River
- rupiah
- rupiahs