appreciation vs approving

appreciation and approving both are nouns.

Word	Noun	Adjective	Verb	Adverb
appreciation	Yes	No	No	No
approving	Yes	Yes	No	No

As nouns, approving is a hypernym of appreciation; that is, approving is a word with a broader meaning than appreciation:

Other hypernyms of appreciation include approval, blessing.

appreciation (noun)	approving (noun)
a favorable judgment	the formal act of approving
an increase in price or value
understanding of the nature or meaning or quality or magnitude of something
delicate discrimination (especially of esthetic values)
an expression of gratitude

appreciation (adjective)	approving (adjective)
	expressing or manifesting praise or approval