undulation vs pulsing

undulation and pulsing both are nouns.

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

As nouns, pulsing is a hyponym of undulation; that is, pulsing is a word with a more specific, narrower meaning than undulation:

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

undulation (noun)	pulsing (noun)
(physics) a movement up and down or back and forth	(electronics) a sharp transient wave in the normal electrical state (or a series of such transients)
wavelike motion; a gentle rising and falling in the manner of waves
an undulating curve