leaflet vs leaf

leaflet and leaf both are nouns.

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

As nouns, leaf is a hypernym of leaflet; that is, leaf is a word with a broader meaning than leaflet:

Other hypernyms of leaflet include foliage, leafage.

leaflet (noun)	leaf (noun)
a thin triangular flap of a heart valve	hinged or detachable flat section (as of a table or door)
a small book usually having a paper cover	a sheet of any written or printed material (especially in a manuscript or book)
part of a compound leaf	the main organ of photosynthesis and transpiration in higher plants

leaflet (verb)	leaf (verb)
	produce leaves, of plants
	turn over pages
	look through a book or other written material