leaf vs leafage

leaf and leafage both are nouns.

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

As nouns, leaf and leafage are synonyms defined as:

leaf and leafage: the main organ of photosynthesis and transpiration in higher plants

Other synonyms of leaf include foliage.

leaf (noun)	leafage (noun)
hinged or detachable flat section (as of a table or door)	the main organ of photosynthesis and transpiration in higher plants
a sheet of any written or printed material (especially in a manuscript or book)
the main organ of photosynthesis and transpiration in higher plants

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