There are many previous threads on beds in this H&G forum so if you run the search option here you should find your answer as it has been discussed here before.
These terms are used differently in different countries so I would not use these terms
but simply ask what size the bed is !
In Ireland, a normal double bed is 4ft 6, a king is 5 ft wide and I think a super king is 6 ft. I have no idea what a queen size bed is in Ireland, I have never heard the term used.
In America a king size bed is way bigger than 5ft wide.
Super King is the biggest standard size available 6ft (w) x 6ft 6" (l)
You can get a Bigger size, 7ft x 7ft
Different manufacturers may have different names on the sizes, but most Uk and Ireland companies use
Small Single (75cm) - 2ft 6in x 6ft 3in
Single (90cm) - 3ft x 6ft 3in
Small Double (120cm) 4ft x 6ft 3in
Double (135cm) 4ft 6in x 6ft 3in
King (150cm) - 5ft x 6ft 6in
Super King (180cm) - 6ft x 6ft 6in