traveling wave vs undulation

traveling wave and undulation both are nouns.

Word	Noun	Adjective	Verb	Adverb
traveling wave	Yes	No	No	No
undulation	Yes	No	No	No

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

traveling wave: a wave in which the medium moves in the direction of propagation of the wave
undulation: (physics) a movement up and down or back and forth

Other hypernyms of traveling wave include wave.

traveling wave (noun)	undulation (noun)
a wave in which the medium moves in the direction of propagation of the wave	(physics) a movement up and down or back and forth
	wavelike motion; a gentle rising and falling in the manner of waves
	an undulating curve