accompaniment vs occurrence

accompaniment and occurrence both are nouns.

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

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

accompaniment: an event or situation that happens at the same time as or in connection with another
occurrence: an event that happens

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

accompaniment (noun)	occurrence (noun)
the act of accompanying someone or something in order to protect them	an event that happens
something added to complete or embellish or make perfect	an instance of something occurring
a musical part (vocal or instrumental) that supports or provides background for other musical parts
an event or situation that happens at the same time as or in connection with another