oscillation vs recurrent event

oscillation and recurrent event both are nouns.

Word	Noun	Adjective	Verb	Adverb
oscillation	Yes	No	No	No
recurrent event	Yes	No	No	No

As nouns, recurrent event is a hypernym of oscillation; that is, recurrent event is a word with a broader meaning than oscillation:

oscillation: a single complete execution of a periodically repeated phenomenon
recurrent event: an event that recurs at intervals

Other hypernyms of oscillation include periodic event.

oscillation (noun)	recurrent event (noun)
(physics) a regular periodic variation in value about a mean	an event that recurs at intervals
a single complete execution of a periodically repeated phenomenon
the process of oscillating between states