Atmosphere
Another name for air resistance is aerodynamic drag.
intriguing
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.
Rubella is another name for German measles.
Another name of a dog house is a kennel.
aqueduct
Ghost.
parka
mariner
inclement
Gaucho?
Botany.