association theory vs associationism

association theory and associationism both are nouns.

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

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

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

association theory (noun)	associationism (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