amplexicaul leaf vs foliage

amplexicaul leaf and foliage both are nouns.

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

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

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

Other hypernyms of amplexicaul leaf include leaf, leafage.

amplexicaul leaf (noun)	foliage (noun)
a leaf with its base clasping the stem	(architecture) leaf-like architectural ornament
	the main organ of photosynthesis and transpiration in higher plants