series vs progression

series and progression both are nouns.

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

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

series (noun)	progression (noun)
(mathematics) the sum of a finite or infinite sequence of expressions	the act of moving forward (as toward a goal)
a periodical that appears at scheduled times	a movement forward
a serialized set of programs	a series with a definite pattern of advance
(sports) several contests played successively by the same teams
similar things placed in order or happening one after another
a group of postage stamps having a common theme or a group of coins or currency selected as a group for study or collection
(electronics) connection of components in such a manner that current flows first through one and then through the other