propulsion vs rolling

propulsion and rolling both are nouns.

Word	Noun	Adjective	Verb	Adverb
propulsion	Yes	No	No	No
rolling	Yes	Yes	No	No

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

propulsion (noun)	rolling (noun)
the act of propelling	propelling something on wheels
a propelling force	the act of robbing a helpless person
	a deep prolonged sound (as of thunder or large bells)

propulsion (adjective)	rolling (adjective)
	uttered with a trill