Their is not another name for HIV that starts with an R.
That said, HIV is a type of retrovirus. That is probably the word you are looking for.
Repast
There is no STD that starts with the letter R. Some STDs are herpes, gonorrhea, syphilis, HIV, and chlamydia.
Residence - Place where you reside. Also used : residential
his name is Robert
Rush is a rock group that starts with "R".
rag
reservation
Repair
roam
Ryou.
Russia
Reah