sadhu or saddhu/ʹsahdooh/ noun

• refrangible
• refresh
• refresher
• refresher course
• refreshing
• refreshment
• refried beans
• refrigerant
• refrigerate
• refrigerator
• refringent
• reft
• refuel
• refuge
• refugee
• refugium
• refulgence
• refund
• refurbish
• refusal
• refuse
• refusenik
• refute
• regain
• regal