method of least squares vs least squares

method of least squares and least squares both are nouns.

Word	Noun	Adjective	Verb	Adverb
method of least squares	Yes	No	No	No
least squares	Yes	No	No	No

As nouns, method of least squares and least squares are synonyms defined as:

method of least squares and least squares: a method of fitting a curve to data points so as to minimize the sum of the squares of the distances of the points from the curve

method of least squares (noun)	least squares (noun)
a method of fitting a curve to data points so as to minimize the sum of the squares of the distances of the points from the curve	a method of fitting a curve to data points so as to minimize the sum of the squares of the distances of the points from the curve