Ethidium bromide and acridine orange are both used to stain RNA.

Intercalating dyes react preferentially with double-strAndes nuclei acids, thus the strong signal with DNA. However, they also interact with ds RNA structures, such as the numerous hairpins present in ribosomal RNA.

As mentioned above, yes, EtBr and acridine orange can be used to stain RNA as well as DNA. Keep in mind that these stains are not specific to RNA or DNA, they are generalists for any dsRNA or dsDNA. If you have a mixed sample (both DNA and RNA) both will be stained.

Muskan, Pierre and Amy are both right about the specificity issue as the dyes do not distinguish between DNA and RNA.

I also found this useful table from Thermo-Fisher Scientific that might help you. SYBR Gold and SYBR Green are also viable choices.

https://www.thermofisher.com/us/en/home/life-science/dna-rna-purification-analysis/nucleic-acid-gel-electrophoresis/rna-stains.html

Here's another idea: What about using RNA-specific antibodies to label RNA?

I think either cyber green or cyber gold will be more best.