fig leaf vs foliage

fig leaf and foliage both are nouns.

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

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

fig leaf: a leaf from a fig tree
foliage: the main organ of photosynthesis and transpiration in higher plants

Other hypernyms of fig leaf include leaf, leafage.

fig leaf (noun)	foliage (noun)
a covering consisting of anything intended to conceal something regarded as shameful	(architecture) leaf-like architectural ornament
a leaf from a fig tree	the main organ of photosynthesis and transpiration in higher plants