progression vs procession

progression and procession both are nouns.

Word	Noun	Adjective	Verb	Adverb
progression	Yes	No	No	No
procession	Yes	No	No	No

As nouns, progression and procession are synonyms defined as:

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

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

progression (noun)	procession (noun)
the act of moving forward (as toward a goal)	the group action of a collection of people or animals or vehicles moving ahead in more or less regular formation
a movement forward	the act of moving forward (as toward a goal)
a series with a definite pattern of advance	(theology) the origination of the Holy Spirit at Pentecost