Rhea, a type of large Flightless Birds.
Although a medical term, rhinnorhea is a word that begins with "r" and ends with "a'. It means runny nose.
Czar is a 4 letter word. It begins with C and ends with R.
reporter, recorder
Rotation radiation
prohibiter
Brother
retribution
Nearer
EagerEaterElderEnterErrorEsperEuler
Riding
Words that start with R and end with Y are:racyrainyrallyraspberryraspyratifyrayreadilyreadyreallyrecoveryrectoryregencyregistryrelayrelyriskyrosaryrosyrowdyroyaltyrubyruddyrudelyrunwayrusty
ichor, infer, inter