Based on carse, new words formed by adding one letter at the beginning or end:
aacers   barecas   ccaesar   dbraces   ecabers   fscarce   gcadres   hcedars   isacred   kscared   lcrease   mfacers   nfarces   ocagers   pgraces   rarches   schares   teschar   usearch   vcaries   ycerias   zericas