The size or dimension of the word 'but' is three letters. The word for a person's backside or buttocks is referred to as a 'butt' so it's size or dimension would be 4 letters in length.
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A but is typically 127-152 millimeters (5-6 inches) in size.
Scotland is approximately 19 million acres in size.
A country that is approximately 125,000km in size is Japan.
Syria is about the size of North Dakota. Not a country but it helps to put things in perspective.
Kenya is approximately 224,081 square miles in size.
Jordan is roughly the size of the US state of Maine. Both regions are similar in terms of land area and population size.