middle fifty vs interquartile range

middle fifty and interquartile range both are nouns.

Word	Noun	Adjective	Verb	Adverb
middle fifty	Yes	No	No	No
interquartile range	Yes	No	No	No

As nouns, middle fifty and interquartile range are synonyms defined as:

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

Other synonyms of middle fifty include midspread.

middle fifty (noun)	interquartile range (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.