covering vs foliation

covering and foliation both are nouns.

Word	Noun	Adjective	Verb	Adverb
covering	Yes	No	No	No
foliation	Yes	No	No	No

As nouns, foliation is a hyponym of covering; that is, foliation is a word with a more specific, narrower meaning than covering:

covering (noun)	foliation (noun)
the act of protecting something by covering it	the production of foil by cutting or beating metal into thin leaves
the work of applying something	the work of coating glass with metal foil
the act of concealing the existence of something by obstructing the view of it	(architecture) leaf-like architectural ornament
an artifact that covers something else (usually to protect or shelter or conceal it)	(geology) the arrangement of leaflike layers in a rock
a natural object that covers or envelops	(botany) the process of forming leaves