blast wave vs undulation

blast wave and undulation both are nouns.

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

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

blast wave: a region of high pressure travelling through a gas at a high velocity
undulation: (physics) a movement up and down or back and forth

Other hypernyms of blast wave include wave.

blast wave (noun)	undulation (noun)
a region of high pressure travelling through a gas at a high velocity	(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