Gestalt principle of organization vs Gestalt psychology

Gestalt principle of organization and Gestalt psychology both are nouns.

Word	Noun	Adjective	Verb	Adverb
Gestalt principle of organization	Yes	No	No	No
Gestalt psychology	Yes	No	No	No

Gestalt principle of organization (noun)	Gestalt psychology (noun)
a principle of Gestalt psychology that identifies factors leading to particular forms of perceptual organization	(psychology) a theory of psychology that emphasizes the importance of configurational properties