praise vs approval

praise and approval both are nouns.

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

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

Other hypernyms of praise include commendation.

praise (noun)	approval (noun)
an expression of approval and commendation	the formal act of approving
offering words of homage as an act of worship	a message expressing a favorable opinion
	a feeling of liking something or someone good
	acceptance as satisfactory

praise (verb)	approval (verb)
express approval of