booklet vs folder

booklet and folder both are nouns.

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

As nouns, booklet and folder are synonyms defined as:

Other synonyms of booklet include brochure, leaflet, pamphlet.

booklet (noun)	folder (noun)
a small book usually having a paper cover	covering that is folded over to protect the contents
	a small book usually having a paper cover