We do not currently know of any synonyms for rose geranium.
The noun rose geranium is defined as:
Any of several pelargoniums having leaves with a rosescent, including inportant sources of rosewater and of rose fragrances. Although said to be the species Pelargonium graveolens, Pelargonium capitatum and Pelargonium radens, the rose geraniums in cultivation are pretty much all hybrids, with those species among the parents.