break out vs pain

break out is not a noun while pain is a noun.

Word	Noun	Adjective	Verb	Adverb
break out	No	No	Yes	No
pain	Yes	No	Yes	No

As verbs, pain is a hypernym of break out; that is, pain is a word with a broader meaning than break out:

Other hypernyms of break out include ail, trouble.

break out (noun)	pain (noun)
	a somatic sensation of acute discomfort
	something or someone that causes trouble; a source of unhappiness
	emotional distress; a fundamental feeling that people try to avoid
	a symptom of some physical hurt or disorder

break out (verb)	pain (verb)
become raw or open	cause bodily suffering to and make sick or indisposed
begin suddenly and sometimes violently	cause emotional anguish or make miserable
start abruptly
take from stowage in preparation for use
move away or escape suddenly