Rump & or rear end.
A proctologist.
1 as,s is another name for a donkey2 or in "slang" it is another way to say butt
Yes, It's another name for butt.
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.
Atmosphere
intriguing
Another name of a dog house is a kennel.
Rubella is another name for German measles.
S.o.s
brew
Gaucho?
Repast