plant organ vs leaf

plant organ and leaf both are nouns.

Word	Noun	Adjective	Verb	Adverb
plant organ	Yes	No	No	No
leaf	Yes	No	Yes	No

As nouns, leaf is a hyponym of plant organ; that is, leaf is a word with a more specific, narrower meaning than plant organ:

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

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