vibration vs undulation

vibration and undulation both are nouns.

Word	Noun	Adjective	Verb	Adverb
vibration	Yes	No	No	No
undulation	Yes	No	No	No

As nouns, undulation is a hypernym of vibration; that is, undulation is a word with a broader meaning than vibration:

Other hypernyms of vibration include wave.

vibration (noun)	undulation (noun)
the act of vibrating	(physics) a movement up and down or back and forth
a distinctive emotional aura experienced instinctively	wavelike motion; a gentle rising and falling in the manner of waves
(physics) a regular periodic variation in value about a mean	an undulating curve
a shaky motion