appreciation vs approval

appreciation and approval both are nouns.

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

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

Other hypernyms of appreciation include approving, blessing.

appreciation (noun)	approval (noun)
a favorable judgment	the formal act of approving
an increase in price or value	a message expressing a favorable opinion
understanding of the nature or meaning or quality or magnitude of something	a feeling of liking something or someone good
delicate discrimination (especially of esthetic values)	acceptance as satisfactory
an expression of gratitude