regression analysis vs regression

regression analysis and regression both are nouns.

Word	Noun	Adjective	Verb	Adverb
regression analysis	Yes	No	No	No
regression	Yes	No	No	No

regression analysis (noun)	regression (noun)
the use of regression to make quantitative predictions of one variable from the values of another	returning to a former state
	the relation between selected values of x and observed values of y (from which the most probable value of y can be predicted for any value of x)
	(psychiatry) a defense mechanism in which you flee from reality by assuming a more infantile state
	an abnormal state in which development has stopped prematurely