the-the- /θi/ prefix 
another form of theo-
another form of theo-- Royal Mail
- Royal Marines
- Royal Mile
- Royal Military Academy
- Royal Mint
- Royal National Theatre
- Royal Naval College
- Royal Navy
- Royal Opera House
- Royal Pavilion
- Royal Philharmonic Orchestra
- Royal Scot
- Royal Shakespeare Company
- Royal Society
- Royal Tournament
- royalty
- Royal Ulster Constabulary
- Royal Variety Performance
- Royal Worcester
- Royal Yacht
- Roy Rogers
- RP
- rpm
- RPO
- R & R