rasguear, to thrum.
rastrero -a, crawling.
rastro, m., track, trace.
ratero -a, m. and f., thief, pickpocket.
rato, m., while, time; á (or al) poco rato, in a little while; un buen rato, a good while, for some time.
ratoncillo, m. (dim. of ratón), little mouse.
raudal, m., stream, abundance; raudales, plur., volume.
raudamente, rapidly.
raudo -a, rapid.
raya, f., line, dash; sacar la raya, to part one's hair.