midspread vs middle fifty

midspread and middle fifty both are nouns.

Word	Noun	Adjective	Verb	Adverb
midspread	Yes	No	No	No
middle fifty	Yes	No	No	No

As nouns, midspread and middle fifty are synonyms defined as:

midspread and middle fifty: a measure of statistical dispersion, being equal to the difference between the upper and lower quartiles.

Other synonyms of midspread include interquartile range.

midspread (noun)	middle fifty (noun)
a measure of statistical dispersion, being equal to the difference between the upper and lower quartiles.	a measure of statistical dispersion, being equal to the difference between the upper and lower quartiles.