brochure vs booklet

brochure and booklet both are nouns.

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

As nouns, brochure and booklet are synonyms defined as:

Other synonyms of brochure include folder, leaflet, pamphlet.

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