leaflet vs pamphlet

leaflet and pamphlet both are nouns.

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

As nouns, leaflet and pamphlet are synonyms defined as:

Other synonyms of leaflet include booklet, brochure, folder.

leaflet (noun)	pamphlet (noun)
a thin triangular flap of a heart valve	a brief treatise on a subject of interest; published in the form of a booklet
a small book usually having a paper cover	a small book usually having a paper cover
part of a compound leaf