waveform vs undulation

waveform and undulation both are nouns.

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

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

waveform: the shape of a wave illustrated graphically by plotting the values of the period quantity against time
undulation: (physics) a movement up and down or back and forth

Other hypernyms of waveform include wave.

waveform (noun)	undulation (noun)
the shape of a wave illustrated graphically by plotting the values of the period quantity against time	(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