entire leaf vs leafage

entire leaf and leafage both are nouns.

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

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

entire leaf: a leaf having a smooth margin without notches or indentations
leafage: the main organ of photosynthesis and transpiration in higher plants

Other hypernyms of entire leaf include foliage, leaf.

entire leaf (noun)	leafage (noun)
a leaf having a smooth margin without notches or indentations	the main organ of photosynthesis and transpiration in higher plants