pamphlet vs folder

pamphlet and folder both are nouns.

Word	Noun	Adjective	Verb	Adverb
pamphlet	Yes	No	No	No
folder	Yes	No	No	No

As nouns, pamphlet and folder are synonyms defined as:

Other synonyms of pamphlet include booklet, brochure, leaflet.

pamphlet (noun)	folder (noun)
a brief treatise on a subject of interest; published in the form of a booklet	covering that is folded over to protect the contents
a small book usually having a paper cover	a small book usually having a paper cover