are letters that make 'ER'
are words within 'ER'
CER, ERA, erg, ers, fer, her, per, ser, sers, ere, ern, Ler, ERT, era, err
are words created by adding a letter to 'ER'
1 possible definitions for 'ER'
Under this definition, er is a noun and has the following properties:
has the same meaning as ER
'ER' can be a type of hospital room.