acting out vs ebullition

acting out and ebullition both are nouns.

Word	Noun	Adjective	Verb	Adverb
acting out	Yes	No	No	No
ebullition	Yes	No	No	No

As nouns, ebullition is a hypernym of acting out; that is, ebullition is a word with a broader meaning than acting out:

acting out: a (usually irritating) impulsive and uncontrollable outburst by a problem child or a neurotic adult
ebullition: an unrestrained expression of emotion

Other hypernyms of acting out include blowup, effusion, gush, outburst.

acting out (noun)	ebullition (noun)
a (usually irritating) impulsive and uncontrollable outburst by a problem child or a neurotic adult	an unrestrained expression of emotion
(psychiatry) the display of previously inhibited emotions (often in actions rather than words); considered to be healthy and therapeutic