booklet vs brochure

booklet and brochure both are nouns.

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

As nouns, booklet and brochure are synonyms defined as:

Other synonyms of booklet include folder, leaflet, pamphlet.

booklet (noun)	brochure (noun)
a small book usually having a paper cover	a small book usually having a paper cover