Doppler shift vs propagation

Doppler shift and propagation both are nouns.

Word	Noun	Adjective	Verb	Adverb
Doppler shift	Yes	No	No	No
propagation	Yes	No	No	No

As nouns, propagation is a hypernym of Doppler shift; that is, propagation is a word with a broader meaning than Doppler shift:

Doppler shift: change in the apparent frequency of a wave as observer and source move toward or away from each other
propagation: the movement of a wave through a medium

Doppler shift (noun)	propagation (noun)
change in the apparent frequency of a wave as observer and source move toward or away from each other	the act of producing offspring or multiplying by such production
	the spreading of something (a belief or practice) into new regions
	the movement of a wave through a medium