progression vs onward motion

progression and onward motion both are nouns.

Word	Noun	Adjective	Verb	Adverb
progression	Yes	No	No	No
onward motion	Yes	No	No	No

As nouns, progression and onward motion are synonyms defined as:

progression and onward motion: the act of moving forward (as toward a goal)

Other synonyms of progression include advance, advancement, forward motion, procession, progress.

progression (noun)	onward motion (noun)
the act of moving forward (as toward a goal)	the act of moving forward (as toward a goal)
a movement forward
a series with a definite pattern of advance