serrate leaf vs foliage

serrate leaf and foliage both are nouns.

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

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

serrate leaf: a leaf having a margin notched like a saw with teeth pointing toward the apex
foliage: the main organ of photosynthesis and transpiration in higher plants

Other hypernyms of serrate leaf include leaf, leafage.

serrate leaf (noun)	foliage (noun)
a leaf having a margin notched like a saw with teeth pointing toward the apex	(architecture) leaf-like architectural ornament
	the main organ of photosynthesis and transpiration in higher plants