associationism vs association theory

associationism and association theory both are nouns.

Word	Noun	Adjective	Verb	Adverb
associationism	Yes	No	No	No
association theory	Yes	No	No	No

As nouns, associationism and association theory are synonyms defined as:

associationism and association theory: (psychology) a theory that association is the basic principle of mental activity

associationism (noun)	association theory (noun)
(psychology) a theory that association is the basic principle of mental activity	(psychology) a theory that association is the basic principle of mental activity