Flyer.
EagerEaterElderEnterErrorEsperEuler
Sugar
Five letter words that start and end with R:radarrazorrecurreferricerriderrigorriverrotorroverrulerrumor
their
ichor, infer, inter
Spree
revel, rival, rural
Czar is a 4 letter word. It begins with C and ends with R.
or
Rotor, radar, river, racer, razor, refer, rumor, Roger
registrar
further