pulsing vs undulation

pulsing and undulation both are nouns.

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

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

pulsing: (electronics) a sharp transient wave in the normal electrical state (or a series of such transients)
undulation: (physics) a movement up and down or back and forth

Other hypernyms of pulsing include wave.

pulsing (noun)	undulation (noun)
(electronics) a sharp transient wave in the normal electrical state (or a series of such transients)	(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