leaf vs written language

leaf and written language both are nouns.

Word	Noun	Adjective	Verb	Adverb
leaf	Yes	No	Yes	No
written language	Yes	No	No	No

leaf (noun)	written language (noun)
hinged or detachable flat section (as of a table or door)	communication by means of written symbols (either printed or handwritten)
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)	written language (verb)
produce leaves, of plants
turn over pages
look through a book or other written material