oscillation vs periodic event

oscillation and periodic event both are nouns.

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

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

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

Other hypernyms of oscillation include recurrent event.

oscillation (noun)	periodic 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