compound leaf vs leafage

compound leaf and leafage both are nouns.

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

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

compound leaf: a leaf composed of a number of leaflets on a common stalk
leafage: the main organ of photosynthesis and transpiration in higher plants

Other hypernyms of compound leaf include foliage, leaf.

compound leaf (noun)	leafage (noun)
a leaf composed of a number of leaflets on a common stalk	the main organ of photosynthesis and transpiration in higher plants