amplexicaul leaf vs leafage

amplexicaul leaf and leafage both are nouns.

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

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

amplexicaul leaf: a leaf with its base clasping the stem
leafage: the main organ of photosynthesis and transpiration in higher plants

Other hypernyms of amplexicaul leaf include foliage, leaf.

amplexicaul leaf (noun)	leafage (noun)
a leaf with its base clasping the stem	the main organ of photosynthesis and transpiration in higher plants