A word that means annoying and starts with "r" is "irksome." It describes something that causes irritation or annoyance. Another option is "riling," which refers to provoking or irritating someone. Both words effectively convey a sense of annoyance.
"Ragged" is a six-letter word that starts with an r and means tattered and shaggy.
remarkable
remedial?
ripe
rhythm.
remarkable
Pift! Everyone knows that, it's Nager
One such word is resume.
rumble
resist
repugnant
riant