irruption vs occurrence

irruption and occurrence both are nouns.

Word	Noun	Adjective	Verb	Adverb
irruption	Yes	No	No	No
occurrence	Yes	No	No	No

As nouns, occurrence is a hypernym of irruption; that is, occurrence is a word with a broader meaning than irruption:

irruption: a sudden violent spontaneous occurrence (usually of some undesirable condition)
occurrence: an event that happens

Other hypernyms of irruption include happening, natural event, occurrent.

irruption (noun)	occurrence (noun)
a sudden violent entrance; a bursting in	an event that happens
a sudden violent spontaneous occurrence (usually of some undesirable condition)	an instance of something occurring
a sudden sharp increase in the relative numbers of a population