ER

1. Edwardus Rex (New Latin), King Edward
2. Elizabeth Regina (New Latin), Queen Elizabeth (EIIR Queen Elizabeth II)
3. Emergency room (N American)

er /ûr/

Expressing hesitation

Er (chem)

Erbium

-er¹ /-ər/

1. Marks the agent (person or thing)
2. Designates people according to occupation (eg writer), or place of origin or abode (eg Londoner)

-er² /-ər/

Marks the comparative degree of some adjectives (longer) and some adverbs (faster)

-or /-ər/

(esp in words derived from Latin and legal terms) denoting a person or thing that performs an action or function, as in actor, elevator

—In most words indicating an agent either -or is standard or -er is standard, but in some both endings are acceptable

• change point
• change points
• changer
• change-ringing
• changers
• changes
• change tack
• change the goalposts
• change the leg
• change up
• change-up
• change-ups
• changing
• changing-piece
• changing-pieces
• changing room
• changing rooms
• chank
• chanks
• chank-shell
• chank-shells
• channel
• channeled
• channeler
• channelers