Ireland is normally abbreviated to three letters as IRL or sometimes IRE. A four letter word for Ireland is its name in the Irish language, which is Éire. That is not an abbreviation.
Erin, Éire, or Ériu.
"Home"?
"Éire"?
Eire
A four-letter synonym for Ireland is "Eire" - but this is not an abbreviation.
An four letter abbreviation for Connecticut is Conn.
The abbreviation used on CARS when people travel aborad is IRL for example.
The abbreviation for Saskatchewan Canada is SK
USPS
four letter word for facts: data (also info, but that's an abbreviation)
cork
crts (abbreviation for cathode ray tubes)
IRE and IRL are both used as abbreviations for Ireland.
The standard two letter abbreviation for the state of South Dakota is SD.
Norther Ireland
Supersonic transport Abbreviation: SST and pl. SSTS